There's a car event over my way 1 sunday a month, pretty popular still, it's called MFN. i dont tend to go myself but theres a good turn out of all sorts of cars.
Prob find its a tad far for most of us (were pretty well spread over the uk). might be worth keeping an eye out for a rolling road day and heading to that.
Does the key still allow the car to start?
if so the key/fob may be fine and you just need to re-code it to the car (they do occasionally have a flip out and lose the coding), had it with the spare key for mine. Let me know if you need to coding info
As above, ecu is there to control the boost ;) just get it mapped rather than blow up your engine.
only caveat is a 3 port boost control solenoid, but that's about giving more control to the mapper rather than upping the boost.