I think we can order it to Canada ($25 delivery cost) but we need to pay return to UK so it is a pretty costly experiment if you don't know the brand and sizing. I am not even mentioning duties and taxes...
On the other hand my Mom wants to visit London (UK) and maybe we will go in the spring: if so I know which store I am going to visit there...
BTW there are 2 more which may be a possibility at length 69 and 68 cm...