Good idea Kimmy.

I know the Kodak kiosks in Boots are usually 6x4 and 8x6 but have also seen some that do 10x8.

You could save an image to a memory stick/flash drive and go into a photo processing shop, but they may refuse due to copyright.

If there is an instant photo printing kiosk you should be able to bypass staff checking it. But I don't know if they print the size you are after.

Anyone know of a shop in London where I could buy some Usain Bolt photos (10x8 or larger if poss)?
I need 1 for the weekend so don't have time to order from the internet sadly.....