Hello Paul, You'll find AJD Landrovers Unit N5, Essex Road, Hodesdon, Herts postcode EN11 OFB. Is not that far away, they are right near the Fish and Eels Pub at Dobbs Weir. They are a well established local independent LR specialist and will plug you in and reset fault codes, make adjustments on Testbook at £40 a time. They know P38s inside out and carry a good stock of spares. Hope this is useful. I've found them to offer a first class service. JV ROVERMAN, P reg P38 DT, 51 reg P38DHSE, 1960 Rover P4.