Hi sorry I'm not up on technology.
Is it possible to use a picture from a digital camera that I have downloaded onto computer and then put it on disk and get a shop to make it into a proper photo. I no longer have the picture on the camera.

Hope that is understandable

i believe it is, because shops can get the photo from a cd direct from the camera, so it might be the same.

Yes, that's how I normally get my photos developped. 

you can also use online photo shops like http://www.photobox.co.uk/index.html its free to join and you just upload from your computer

Yes,
Most of the High street places like Happy snaps etc will do it :)
Alternatively go to a large branch of Boots the chemist and they have little stand alone self help machines, you can put your disk (or memory card, or mob phone sim card etc etc) in the machine and it displays all the photo's you can then choose (on a touch screen) which ones you want to print off as photo's,enlarge and get extra copies too, cant remember how much it is around 20p ish I think for each one.

Thanks everyone will get pics sorted for the year book which I had forgotten about