My local store (Westwood Cross) had a £5 off a £25 spend leaflet on Electrical (including Games), Home, Toys and Stationery.
I've posted details of here: http://www.hotukdeals.com/deals/tesco-5-off-a-25-spend-electrical-including-games-home-toys-stationery-instore-leaflet-2095978
Hopefully the voucher is available in other people's stores too, please report back if you have any luck.
For reference, I couldn't see Littlebigplanet 3 on the PS3 out on the shelves so I had to ask at the Click and Collect desk and they were able to fish a copy from out back.
Both Littlebigplanet 3 and WWE 15 on the PS3 are currently priced up at £25 before using the leaflet.
This voucher should work on other games and other items, but these were the only 2 I was hunting at the time.
Apologies for the lack of pictures, I only thought to post it this morning on the way to work.
Please note the WWE15 game was for a gift, not for myself. I felt it was important to point that out =p