I have never heard about "UK voiced versions" but do not doubt that - just never been exposed to it.What bothers me the most about Rega in general (and some other British audio companies) is the fact that they try to do and succeed in making something exceptional in pursuit of musicality and even make people believe that. I remember an amplifier a few (more than a few) years ago that was globally available but they introduced a "UK voiced version". If that version was any better than the regular one, why didn't they use the modification on all amps of that model? The cost difference, if any, was probably less than a dollar.
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I do think we owe a lot to the UK in audio - the original linear LS3/5 (I seem to recall) that is still held up in high (albeit nostalgic) esteem etc. My dad owned Spendors which for all I know were the best back in the day. But the fact is the world has moved on a lot, and many UK audio brands live off odd idiosyncrasies that simply don't fly (nor do they sound better, unless you completely absorb every byte of WhatHifi which is a monthly sponsored trade how).
Don't get me wrong of course UK-based companies still can and do deliver on stellar audio - KEF is a company I'd always check for speakers. But there also is a lot of whacky stuff out there - won't get into brands.
Personally I find it utterly laughable that the audio community believes different countries have different audio cultures and hence local companies cater to such "granular", "local" needs. They don't. They just market themselves as traditional UK companies even when they are Chinese owned (and I have no immediate issue with that, *we* let that happen in manufacturing and business).