I've broken the tiny plastic coupling on the rear of my Hornby Arnold Brighton Belle power car which has left the wiring link dangling.
The replacement part no. is HN3000/12 and to my mind is not something I would like to fit. There are some minute springs which are bound to disappear.
Does anybody know any competent n gauge repairers who'd be prepared to tackle this?

You could try contacting Hornby direct. I know they have a workshop for such things.