I know this is way off topic but a few pointers might help....

Delivered to my yard last night after 6 weeks parked up in London while
the owner (my youngest) swanned off to Australia. Two failed attempts by
the AA to get it going followed by a tow home.

R reg. Gti, AA comment *probably a partly disconnected immobiliser*.

Apart from putting the battery on charge and poking Google for a circuit
diagram (buried in a zillion Haynes download offers), failed, I have
done nothing:-)

Where do I start?

I can check ignition and fuel for power but, assuming one or both are
disconnected what then?

Where do these gizmos get fitted, is the key fob transmitter relevant
etc.

regards
--
Tim Lamb