Thanks Simon.
To quote Caterham.
"The engine upgrade includes upgraded camshafts, valve springs (if required) and uprated injectors (if required), we also load a new map onto the ECU to take into account the new cams. Then we also replace the intake system with the roller barrels, this includes balancing and testing the roller barrels are operating correctly, we also map the ECU for the roller barrels too"
That's 2 maps on 1 ECU.. think I have talked myself out of it. Going to talk to other suppliers.