What a brilliant forum
Found you simply by googling my DC40 brush bar not working.
Would have wasted money on at least a new head motor until I found out on here about the inherent fault on these where the wires are actually clean cut, somehow?
Anyway, using my trusty soldering iron, heat shrink tubing and a lot of cursing, thanks to beko1987's incredible pictorial stripdown I've got ours running for now until I get a new loom. Just need to find out what is cutting through the wires...