FIXED!
A big thank you to Pete12345 for the use of his Nanocom which pointed me in the right direction & yes Wammers you were correct, it was the ABS ECU. I got hold of one from ebay with the same spec. plugged it in- no ABS Fault showed on the display. Put it in gear & drove off, as soon as it moved Speedo worked & once I reached 5mph the ABS light went out....just as it should!
Thanks again to all.

Hi this happened to me on me 2001 2.5 Diesel P38. It turned out to be a 5 amp fuse in the fuse box under the bonnet marked up as Abs on the fuse box lid.

Hope this helps.

Pappie.

That post was in 2015