Success!
Gave the thing a sharp shock as described and it went low ohms. I probably wouldn’t have guessed this technique. Rebuilt & tested the washer and it is now whirring its way through a mountain of laundry!
I think (hope) this may a one off, since the brushes and armature don’t seem...
Problem with Hotpoint WD61 washer dryer: this may be a bit old now but it’s quite “low mileage” and doesn’t leak! I am very loathed to buy a replacement motor/ control board or even whole machine £££!!!
It is frustrating that more info is not available and am possibly condemned to spending...