OBD Port

above your right knee when ya driving, is in mine anyway, next to the bonnet release
 
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If you contact Nigel @NHN, he is a site sponsor and a seller for the Ross-Tech leads.
 
Oh yes so he was, sorry misread! :(
 
It's a lot easier to put a switch in line with the powered pin on the port. Put the switch inside the drivers side fuse box, flick it on when you take the car for a service, have it flicked off all the rest of the time.
Any scrote trying to steal it will soon give up.