Does the HOME button work (that's the round one on the face of the phone). If it doesn't there's nothing you can do. The SLEEP button is on the top edge of the phone. Does that work?
Do the following, EXACTLY:
On step 8 if the message hasn't appeared after 2 minutes there's a problem with your computer that you will have to resolve first. See: http://support.apple.com/kb/TS1538
If anything doesn't work as I described tell me which step and what the outcome was.
Thanks for all your help Lawrence.
Still wouldn't boot into recovery/UDF mode so took I it to a repair shop who, reinstalled 'OS 4.1' (Ithink it was) and then updated to current 'OS 6.1.2
All is now working 'fine and dandy'.