I emailed this company to enquire about their £44 fancy box for my 2012 van
http://www.rsg-ontop.com/shop/100_Run_Lock_Systems"I am sorry to say that it is unlikely to work.
We would recommend using a vehicle specific CAN-based run lock system
in order to ensure that the part is effective
The Mk7 is £159.00 exc. VAT (3-5 working day lead time).
No extra Relays are needed for the install, just a momentary Switch which are £24.00.
Please note that the remote central locking will not work when in runlock but the central locking still works by using the key in the door"
I`m planning doing similar to what Loot has said tbh, I have a friend in the ambulance workshops so hoping to get a rough wiring diagram "print out" before i touch anything (I`m shite with the wires)