I still don't fully understand why UK prices can be so high.
There's no competition. Where there could be, it's locked down.
* overseas brand has an exclusive deal with a UK importer, the brand needs this to get established, and the importer in effect controls the distribution chain ie the network of LBS they supply
* the brand forbids anyone else (eg retailers in their own country) from shipping to the UK, probably on pain of having their supply cut off. This is probably part of their deal with the importer
* the importer will only supply specific shops, and can basically control the price
All the various parties will tell you this is in your best interest, but if they were really working in your best interest they'd open up the distribution chain from these exclusive interests and let it find its own level. Basically there is no free market.
There is an upside - this system allows a space for the home-growns too operate in, eg On One, Cotic, Genesis, Singular, Whyte and so on. Canyon also get in under the radar.
But if the product you fancy is American, you're stuffed. Even hardtails like Niners and Canfields are knocking on to 900 quid. You may be happy to import a hardtail and build it yourself, but the option is not avaiable to you.