It is not illegal to record the voice or noise from another person, it is only illegal to use this as evidence in court against them as in recording a confession to a murder etc. I used a dictaphone to record verbal abuse from another owner in my strata plan (as well as video surveillance cameras but that’s another story). The Police told me I should inform the owners at the time I am recording them (not necessarily beforehand) but when it got to court, the Magistrate told me that he will ‘hear’ evidence on a dictaphone of the verbal abuse & that I did not need their permission to record them. I don’t know if this was just this particular Magistrate’s decision on the day but this owner used to say to me, while I was recording, “You can’t record my voice” which, of course, proved they knew they were being recorded anyway – ha! I think the best way to know is to ask the people you intend to take it to eg the OFT or CTTT as in what evidence they will hear. If you ask the Police for advice, I’d ask a number of different officers as the answers can differ. A Solicitor could give better advice & you can get free advice on simple matters like this through your local community. Hope this helps.