Wasn't the phony Buzzfeed-published "dossier" that alleged ties between Trump and the Russians put together by a former Brit MI6 intel operative - Christopher Steele - and verified to John McCain by former Brit Ambassador to Moscow Andrew Wood?
The notion that the Brits were never involved in some form of surveillance or other intelligence program targeting the Trump campaign and/or the Russians is a bit tenuous given their involvement in the dossier fiasco initiated during the primaries and revealed during the transition.