To manage the expectations, some explanation from my side.
Installation can be split in 2 parts. 1st is electrical part, where you solder the wires and connect everything to existing harness and TCS, 2nd is routing the wires, hiding it behind some plastic covers, drilling a hole for potentiometer (or mounting it on the bulkhead). This is quite easy task, but takes time. If i have no hands to help with things like disassembling interior parts , then the maximum we can do is 3 cars per day.
To be clear, i come to UK to help you out and promote the device itself, not earn money on the installation. I am fine with just 3 or even 2 cars per day . More time to chat and relax .
Since there is a big interest i expect you to do some preparations beforehand, so that we do not waste time on easy mechanical tasks.
I propose a task for forum DYI guys - write some guide how to prepare the car before installation. We need easy access to handbrake switch (so we can solder the TCS indication into handbrake wire). Potentiometer location is up to individual preference, if you want it on the dash (near heating /ventilation knobs), you need to provide access to this area.
I will be in Uppingham on friday - who is the closes and can drive up , so we do some investigation and maybe a trial installation ? I do not own VX220 myself, so i am quite limited with what i can do at the moment.
Jacek