It's now back off the road for the following work
Full litronic retrofit (including self levelling) I've had this working on the bench and the way to avoid the DME problems is to............not connect it to the DME!
The system is self contained and as long as it gets a switched 12V from the car and a lights on and main beam signal from the headlamps, along with full connectivity to the sensor and headlamp motors, it works perfectly.
The washers are being fitted as well, the litronic washer bottle is huge compared to standard.
Other upgrades for this year include heated and crested sports seats, spin on filter conversion and I've got a Quaife ATB waiting to go in.
More grunt after that.