All the shipping costs here and then back 4 months later ... to save all the agro, why not buy a
out here in Scotland for example, use it for the four months of summer then sell it on again, you could probably get all your money back or if you're lucky still make a profit. ... You're not thinking straight.. your bike will still be new and waiting for you in Canada when you return. You can't go wrong ...
You'll probably find that the insurance company will hit you harder here if you try and insure a non registered, non U.K spec bike here in anycase.
That's the way I'd do it ... In fact Jonah has one for sale, you might want to think about it and maybe for a few extra bucks he could store it for you until your arrival in 5 months time.