I almost bought one of those mounts too but decided against it after realising a standard digicam just does not have a wide enough lense and you end up with often shody video - its bad enough on the GoPro but I guess you get what you pay for.
That said mount looks like the same design as the GoPro and its really solid as long as it is a flat,smooth,clean surface (i.e no stickers, bends, features etc)
As for UK prices - I eventually just sucked it up as I would have to wait till late September to have anyone able to buy it for me in the states as shipping is about 40USD and customs was too much if it got picked up