Thanks for the replies so far, definitely some good ideas from both of you which I'll take up.
Regarding nav + radio, if I do say so myself I think I'm rather good at that for a new PPL, it was more of a case of flying over a busy Stansted + nav + radio. But I'll do it again (if Essex are being nice!) to work on that. Or if not I'll find something else to give me high (or higher than your usual VFR flight on a nice day) work load, or maybe somebody could suggest something.
Always fancied aerobatics, now I got a good excuse.
Keep 'em coming!