There’s an ambiguity in that GMT is a civil timezone that in the UK is BST when DST is in effect. UTC cannot be affected by DST. I hear a lot of Brits calling

There’s an ambiguity in that GMT is a civil timezone that in the UK is BST when DST is in effect. UTC cannot be affected by DST. I hear a lot of Brits calling their time “GMT” even when DST is in effect. It’s a shorthand for “current time in the UK”. Hence, ambiguous.