Just visited Sainsbury's by Swansea city centre and they had pallets of vegetables and a member of staff holding a sign saying "free vegetables". Amongst the offerings were baking potatoes (2.5kg bags), white maris piper potatoes, broccoli and sprouts.
All had dates of 22nd December on them.
Might be store specific, but worth a look! Plenty left in Swansea city centre store.