to think if my ndn were having a row my reaction would not be to record it

[greenlloon]

is it even legal?

If my ndn was Boris, I'd record it. Anyone else, no

Agree. They probably got paid for that recording too also potentially illegal.

I would and have, when neighbours were recently screaming and smashing things and the kids were screaming for help (I called 999 first then taped what I could in case it helped).

Guardian journalists have stated that the paper doesn't pay for tips, for what it's worth

If my neighbour was a slippery politician like Boris I would record it so it couldn’t be spun as being a lie as part of a campaign against him.

Why don’t you contact the police and report it if you think it’s illegal OP? They won’t do anything, but might satisfy you

YABVU, recordings can be useful evidence.

And you maybe haven't heard of The Nolan Principles?