Sorted it, just deleted my gmail account and reset it up, simples my credit was there plus the nexus guidebook and transformers! Don't know why it didn't work in the first instance but never mind.
Spent all of last night getting to grips with my nexus and it is fabulous. Downloaded and set up SNES and nes ROMs, the tegra designed games are great to play and visually superb.
Hmmm what to do next on it, still can't put it down!

Finally got an evening off to have a bit of nexus time!
Still have not worked out how to get my Google play credit. Set up my account t as instructed but no luck yet unfortunately' seen some screenshots of what I should be looking for, and have purchased an app to see if that helped the process but drawn a blank!
Shall spend a bit of time this evening trying to work it out further if not might try to email support for help!
Other than this slight issue I'm loving my nexus and Enjoying it loads! Will Be keeping an eye on the forum for all your help and advice!