The original claim is that individuals in UK Intelligence unmasked the information that was gained by the NSA. So saying that UK Intelligence Agencies acting in their official capacity did not spy is a literal truth that sidesteps the intent original claim.This is how lawyers /spies lie. They do it by reframe the question to hide what actually happened.
Did individuals in the UK act in any way to assist in exposing NSA information? I don’t know, but answering in this manner is troubling.