Welcome.
I see on another thread that you've signed up with MGoT - good move I try to do three track days a year with them, in fact I'm off to Silverstone at the end of the month.
When the time comes for engine mapping, I'd recommend
Z and F Tuning
. Mark worked for MG Rover on the original maps for the car so he knows what he's doing. In fact the picture on the main page of his website, the one of a laptop on a car seat is my TF.
I've also fiddled about with my suspension but not had a dry track day since, so hopefully if Silverstone is a good day I'll be able to compare to how it felt last year.