Thank you again for your invaluable help and advice. I'll have it checked out. Lloyd at 50c said it is no problem to bill any work carried out. ( I will check, of course that it is within warranty agreements and that any work will not infringe the guarantee).It's unlikely to be buckled given th build standard on these wheels, but worth a check. It's common to have a very small sideways deviation, and if a brake pad is sitting close it can touch with only a minute variation in the rim.
A good local bike shop will be able to identify the ticking sound if it's from the bike or gear hub, and will only be unable to do so if it's from within the motor unit. They'll also be able to say if the wheel needs attention, so you might consider it worth getting an opinion on those.
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BW
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