I use Lidtke brand tryptophan. It's available on Amazon.co.UK
It's not inexpensive here in the U.S., but it's very effective.
Have you searched for other herbs you need on Amazon's UK site? If you know of reliable brands in the UK, then just search for them online from places where customs won't be so involved.
Herb only treatment for Lyme & Bart ended 12/11 - no active symptoms for 2 yrs -Herb only treatment for Babesia ended 12/12www.healingwell.com/community/default.aspx?f=30&m=2977364
Had Lyme, Bart, Babs, RMSF, Ehrlichia, Myco, Anaplasmosis, EBV
New Lyme case 8/2014 - Healed 1/31/15 - unknowingly had Asymptomatic Babs and Asymptomatic Bart, being treated now though (2/2016)