EMBARGOED TO 0001 WEDNESDAY DECEMBER 7 Undated file photo of a person holding a shopping basket in a supermarket. Prices of supermarket own-brand and budget products have increased more than premium and branded foods during the cost of living crisis, according to new figures. Issue date: Wednesday December 7, 2022. (Press Association via AP Images)

File photo dated 03/02/22 of an online energy bill, as people are being urged to donate the '400 they receive through the energy support scheme to help those in need amid the cost-of-living crisis. (Press Association via AP Images)

EMBARGOED TO 0001 TUESDAY DECEMBER 6 File photo dated 03/02/22 of an online energy bill, as people are being urged to donate the '400 they receive through the energy support scheme to help those in need amid the cost-of-living crisis. (Press Association via AP Images)

File photo dated 05/11/20 of a Sainsbury's supermarket, as the supermarket chain has said it will pump a further '50 million into its latest price-cutting push to support customers facing the soaring cost of living. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Conor Murphy MLA speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Michelle O'Neill and Padraig Delargy meeting, Shaun O'Hagan with his partner Dearbhail Ni Reannachain and their child, Banbha Mairghread Ni hAgain outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Conor Murphy MLA speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

(left to right) Conor Murphy MLA, Mayor of Derry City and Strabane District Council, Cllr Sandra Duffy, Sinn Fein Vice President Michelle O'Neill, Ciara Ferguson MLA, and Padraig Delargy outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)

Sinn Fein Vice President Michelle O'Neill speaks to the media outside the Guildhall, Derry City, Co Londonderry. The Stormont executive needs to return to get money into people's pockets during an unprecedented cost-of-living crisis, Michelle O'Neill has said. Speaking during a visit to Londonderry, the Sinn Fein vice president also said people in Northern Ireland were having to choose between buying fuel and food. Picture date: Tuesday November 22, 2022. (Press Association via AP Images)