Britain's Prime Minister Andy Burnham (R) speaks with Sainsbury's CEO Simon Richards (L) as he arrives for a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham (C) walks down a store aisle with London Mayor Sadiq Khan (front L) and Britain's Secretary of State for Work and Pensions Pat McFadden (R) during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham (C) speaks with staff, along with London Mayor Sadiq Khan (2nd L) and Britain's Secretary of State for Work and Pensions Pat McFadden (L), during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham (R) talks with staff during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham talks with staff during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham (C) greets a member of staff during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham (3rd L) speaks with staff, along with London Mayor Sadiq Khan (2nd L) and Britain's Secretary of State for Work and Pensions Pat McFadden (L), during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)

Britain's Prime Minister Andy Burnham talks with staff during a visit to a Sainbury's supermarket in London on August 26, 2026. (Photo by Richard Pohle / POOL / AFP via Getty Images)