I must say it is nice to see this growing interest in mechanical keyboards, a few years ago I was afraid they would die out eventually, however there seems to be a considerable amount if interest now, especially in the far east. Which promises new and interesting products for us
I've been using mechanical keyboards for years myself, my usual everyday keyboard is a Filco Zero tenkeyless which uses XM White switches, these require a high activation force and click very loudly (louder than a buckling spring) ...it's a bit like using an electronic typewriter keyboard actually, well perhaps not quite that extreme but as near as you can get with a keyboard I think. I also have an IBM Model M, which I have had for years, I bought it off 'that auction site' from a guy selling a load of unboxed ones he found somewhere, they were all sealed in their original boxes, totally untouched, despite the fact the one I have actually left the factory in Greenock Scotland in 1995. It's a lovely keyboard to type on, just a little large really, since I really prefer the tenkeyless format for ergonomic reasons, also I do make a lot of use of the left windows key, and the Modem M of course, does not have one.
As you may have guessed I am a fan of very clicky and tactile keyboards, I like a clear tactile bump. Although in all honesty I do sometimes think that the XM Whites are perhaps a little too extreme, a little too hard to press and a little too noisy maybe. The Model M requires quite a lot less force and makes less noise and gives a better feel imo. So do Cherry Blues in my experience. To my knowledge I have never tried the blacks, reds, browns, or a Topre capacitive myself. I have used a few ALPS boards but that was a while ago and to make a fair judgement I'd need to try one again now.
But you sure can buy mechanical keyboards in the UK, indeed we are blessed with probably the best European mechanical keyboard distributor in this country and now that a few of the more well known names in gaming peripherals are starting to really get into mechanical boards I have noticed OcUK's stock growing ...there is always the auction site for the more unusual and harder to find stuff too. Also a lot of the Chinese made stuff is distributed that way.