So this was rattling against the clutch lever but appeared to be well bolted on. A bit of wiggling and it came off in my hand. With the bracket removed I need to decide what to do with it.
So, repair and refit or........
I use the car year round and have the flexy hose on the air intake, which is currently set to 'I'. The hose hasn't actually been on the end of the pipe now removed, for as long as I've owned the car but is in the exhaust direction.