VARUN Electric Bikes for Adults, 27.5" Mountain Bike with 48V 624Wh Battery, 55NM 250W Motor, LCD Display, 5 PAS, Electric Bicycle 21 Speed Gear, Mileage up to 100KM : Amazon.co.uk: Sports & OutdoorsYea,I think I'll take it to a bike shop a let them identify the issue and see how much it would cost to fix and then go from there.
I'd like to either fix the Boardman or trade it in/buy cheap doner and convert for £600 or less. I'll see if that's possible....I would imagine you get more bang for your buck with a cheap conversion that a cheap Chinese brand bike?
Don't forget that the kit you're thinking of buying is all Chinese and most of your present bike comes from China and Taiwan.