Why not order directly from their website? http://www.custom-iem.com/
That's not their website. That's Stephen Guo's website, in America. Great UM dealer, but not UM themselves.
Stephen is well-respected, as a UM dealer, for his attention to good customer service. It also helps that (AFAIK) he is bi-lingual, so he can accurately converse with English-speaking customers and Chinese-speaking UM Lab staff (as, I believe, can Matt, too, at UM Global - uniquemelody.co).
Although I have not personally purchased UM product through Stephen (I bought my Miracles during the Global Promotion, from the now defunct Amp City, who, at that time, were the UK dealers for UM, and who, unfortunately, had appalling customer service), I have repeatedly read good feedback towards Stephen, here on Head-fi. To be even-handed about this, Matt ('UM Global') took good care of me when I needed a reshell due to failure, so I have no particular allegiance to one over the other, either way.
I don't have my finger fully on the pulse, these days, WRT UM distribution, but I believe uniquemelody.co.uk is under the 'UM Global' dealership umbrella (which is overseen by Matt at uniquemelody.co, from Australia, and is also not actually UM labs themselves), whereas Stephen is independent from the 'UM Global' dealership umbrella, so I don't know what his policy is on serving UK customers.
Given that they are independent of one another, there's no direct 'political' conflict, but one would have to e-mail Stephen privately to find out what his stance is on serving UK customers.
I can understand the confusion about UM Lab China and the various intermediaries/dealers. Last I knew (and this may have now changed, but I don't think so), UM Lab China (who are the actual bona fide Unique Melody company) do not deal directly with any customers outside China. So you have 'UM Global', who are an independent network of distributors in various countries, and you also, independently, have Stephen and his international colleagues, forming another network of distributors, serving USA, Russia, etc. In either case, they are not actually joined to UM Lab China.
Best amp i ever used with the Mentor you say? Pico Power!!! the mids and the treble really show its full potential and true color with this so epic amp!!! i am using the WA7 DAC as main cause its musical yet not warm, where the Treble is also the way i want it.
so many DACs been tested no one did give me the mdis of this one, nor the treble, ofc the amp still pico power <3
Also his service is superb and quick to response to any enquiries regardless if it is order related or information on design or features. When I pre-ordered my 3DD, he was also the first to inform me of the faceplate design changes necessitated by the changeable filter design before customers from dealers got informed. UM labs can have difficulties fulfilling orders at times (or many times) but with Stephen at least we are not kept in the dark. Highly recommended. I have easy access to brick and mortar vendors locally but would opt for Stephen any time.