125 to 140 bhp Supersport upgrade:
New cams, flywheel, air filter, rad: £2274 (plus free fitting). here
125 to 150 bhp upgrade:
New cams, throttle bodies, hoses, ECU: £2274 here
Why not combine the two into one upgrade, and see what they get?
Oh, sorry, neither available at the moment, so it's not really worth thinking about 😬
Richy