Charlie, are you only just discovering that there are judgemental pricks on here? Where have you been man?
As far as I know you have done nothing illegal. Roger Cook used to do it, and deny if asked.
I only know from my own experience though, someone recorded me, without telling me, and then tried to use the transcript against me in court. The judge was not interested, and thought the bloke was a wally..
My barrister advised that whilst it is not illegal, it is difficult to get private recordings accepted as “evidence” because the facts of who was speaking and whether or not the recording has been doctored are so difficult to prove. In criminal cases the cops use approved procedures – RIPA etc..
So I would not worry too much, and it might be useful as a stick to beat the other dude with if necessary..