I know this is an old post but it's the regulation of investigatory powers act (RIPA) that does not prevent you from recording conversations between yourself and another individual....the telecommunications act 2000 allows you to as long as one of the persons is party to the conversation (i.e. you) - you cannot however disclose this information to a third person without the consent of the other person that was involved in the call....however a judge may overturn this rule and allow the tape as evidence in court if it is in the public interest (i.e. the person is blatently lying and you say that you have a tape that proves them wrong)... you may however use that tape for personal reason to take transcripts and remind yourself of the conversation..... i get all my information from www.opsi.gov which has all the acts of parliament.....please check this for yourself incase i have got mixed up anywhere....