Guys - many thanks to you all for your input here.
I have very kindly been offered some rides/drives and have e mailed you all separately to try and arrange suitable time/date(Steve B - did you get my e mail I sent on monday?).
Nigel - I think I will be concentrating on the 3 areas you suggest, and your feedback concurs with all the other guys who have inputted on this thread. Already in touch with Caterham about the 4-2-1 pipe to replace the Cat as a first upgrade.
Needless to say, you all agree that the combination of emerald + verniers + suitable map transforms the standard SLR, now all I need to do is convince the wife that I need to spend the money! I'm working on that...
Thanks
Jon *thumbup* *thumbup*