Yes theres two around Plymouth way.
Mc Pherson and Crispys motorcycles.
I am taking a stab in the dark myself, but i don't fancy riding up to Bristol or somewhere because they like to keep it a few hours or so, or even overnight if they don't quite get round to it that day.
I spoke to the guy at Mc Pherson and he said to do all the mods you are intending to, before bringing it in.
Just out of curiosity though, i might take it to him for a dyno run to see what it is achieving before the mods.
They charge £400.
I understand there is a fair bit of work to do to optimise the fuelling, timing, and secondary throttle behaviour. There is the setting up on the rollers, getting to and plugging into the ECU, exhaust probe/s, real time RPM detector, and temperature sensor.
Increasing the rev limiter in all or certain gears, adjusting the cooling fan cut-in and disabling the 02 sensor,
pair valves, exhaust valves (pre 2015), gas tank recirculation servo/valve and the dreaded on/off fuel cut on deceleration (although my SX doesn't seem to suffer with this).
This guy at Mc Pherson then takes the bike out for a few miles to see if he's happy and may tweak a little again.
I will be reporting the findings here on the forum.