My final post in this thread.
Long story short:
Bought my e-Carrera for £1200
Had a fault where it kept cutting out.
Replaced battery - fault still present
Replaced display - fault still present
Replaced ECU - Motor Burned out in shop.
Replaced whole Bike - fault still present
Replaced motor - fault still present
Replaced display - fault still present
Replaced ECU - fault still present
Bottom bracket worn out after less than 1000 miles on new bike as also happened with the old bike.
Halfords Area Manager now kicking up a fuss that the bike is not under warranty if you use it for commercial purposes - IE Deliveroo. Yet I was sold said while dressed in Deliveroo Gear and saying I work for Deliveroo and that I needed a bike to work on.
I am now going to return the bike for a refund during the foul weather when it's less safe to work.
@egroover I'm glad your bike has manifested no faults - I'm still pretty sure ALL Suntour HECS have this fault though as I can't be so unlucky to have two bikes continually fail despite multiple parts replacement on each.