They fly into Cardiff and you can choose if you wish to return from a separate city. They take bikes at no extra charge and they accept them in plastic bags (my favourite).
I'm leaving Toronto for Cardiff at the beginning of October and returning from Gatwick a fortnight later. The cost exclusive of tax is $398 return (US$310). I think that is around 150 pound sterling (sorry, I don't have a symbol on my keyboard).
Seems to be a great price. Brits can use ZOOM to flight to Canada too and the multiple city rates apply to them too.