Doc - I believe Cambiran Tyres are the Imporrter. They supply TyreTek ( https://tyretectrading.co.uk/brand/continental-motorcycle-tyres/) and TwoTyres for instance, I found them very helpful when mytyres let me down - they helped me find who had UK stock... In the end, they helped me locate a tyre in Allan Jeffries, which bizarrely was the cheapest I found anyway!!!
https://www.cambriantyres.co.uk/
They will tell you if there's any out there
Doc, when I had an RT, I used Michelin pilot road tyres. They do a GT version for the rear and work well on the bike.