The actual importation should be easy at this point, just find a reliable seller and order it in. The Bangladesh companies seem to have the best prices right now. Alimul Razi from Incepta, (Parvez on this forum), has been particularly helpful. We have reports of successful purchase from all four Bangladesh companies.
For a slightly higher price, you can join the REDEMPTION eTrials and use MonkMed's sevices. MonkMed likely has a list of Drs. in the UK that will order tests for you, or you could go the route of using independent testing facilities. And
you get the services of MonkMed's Indian doctors for advisory purposes included in the price. There are some people here on the forum from the UK that have used the independent testers. Likely they'll show up here and advise you.
Also, there are many companies out there that will put you together with specialists around the world, as a quick search of "medical tourism" will turn up. For example I searched on a site called WhatClinic.com to find a dentist in Sofia, Bulgaria, to do some emergency dental work for me .... I'm in Sofia right now, it's a nice place. The site has gastroenterologists on their lists.
Bulgaria and Poland are only a quick flight away, and on WizzAir or RyanAir it's inexpensive it you can travel light.
I searched this site,
www.health-tourism.com to find my gastro Dr in Thailand. There are many such sites.
I think I remember a member from the UK jumping over to Spain to find a monitoring Doctor. My point is this .... Don't let the stubbornness of the UK medical system stop you ... You can do this.