Thought I would save myself £35 by 3D printing a replacement rubber mount thingy ma whatsit, it fitted nicely but it looks like the sensor is faulty now as it is sat on the bump stops with flat air bags. Guess I'll have to buy one after all.
So now my disco is sat on the bump stops not going anywhere soon and, I do as much as I can myself (ok purchase now justified ) I have been looking at diagnostic tools. looking at the options nanocom, hawkeye, foxwell nt510 (as recommended by sierrafery in another thread) at a cost of £170 on amazon for what I need I think the foxwell has it.