Why not buy from the official UK importer
http://www.racersinexile.org.uk/ ?
When I e-mailed HobbyWing to enquire about their products they pointed me towards Stuart @ Racers In Exile as their approved UK agent and he has been nothing but helpful and the products are great. The prices are good too, £100 for a ExRun 120A V2.1 which is about £60 cheaper than the equivelent Speed Passion unit.
Stuart will happily deal with an issues you have and although I've had nothing but perfect service from my units I know of one that went back and was replaced by return of post.
Ok his website "live stock" isn't quite as live as it could be some times and there may be a small delay in replying to mails (but they always return phone calls quickly) but that is not unusual for a number of companies.
If you want HobbyWing from a UK source Racers In Exile is the place to go!
Hope that helps people find what they need.