FWIW I had a light of death issue with a PS3 – same as yours with regard to being out of warranty. However, it was a known problem – just kept at them until they finally admitted it and sent me a FOC refurb. Initially they didn’t want to know.
John Lewis also didn’t want to know and were pretty rude which goes against all reviews you hear on stw. Had a ‘manager’ called who was the most arrogant sharp pointy thing you could ever hope to meet. We disagreed on the legislation, quite loudly in front of the queue, until they gave me half the purchase price back to cover the repair cost Sony had quoted.
I ended up well in that case but it took persistance.