Thanks for the advice Simon, PMs sent
From a quick google search it seems that ECU tuning is not legal for P plates but my issue with that is, how would they know? Short of strapping it to a dyno and testing the power..?
As for the warranty, thanks for the warning. It may sound a bit silly but I actually haven't checked the status of the warranty since I bought it (2nd hand). Might be worth a look but it is nearly 3 years old so might not worry too much about it.