I think the recording of exams when only one examiner is present is a good thing; I only wish that Trinity did the same with the ATCL as they do with the LTCL.
My wife did an ATCL Piano exam in Spring, 2007; she had played to a number of people who 'knew what they were about' prior to her exam and they all felt that she didn't have anything to worry about. (She also got a high pass in her LRSM Violin exam a few years ago, so has a good idea what is required to pass a diploma exam!) We were gobsmacked when she failed the A.T. by 13 marks; the examiner's comments bore little resemblance to my wife's view of how things had gone. We wrote a letter of appeal, asking that the recording may at least be listened to again, in order to get a second opinion; they weren't even prepared to do that as the appeal was based on us questioning the judgement of the examiner - i.e. not grounds for an appeal. What is the point of recording the exams if the recording is not to be listened to?!

In Spring, 2008 she passed a DipLCM Piano Diploma with distinction, learning a completely new programme in a few months. Given that both qualifications are accredited at the same level, isn't there something a bit weird going on with Trinity assessment procedures?
By all means record exams, but at least be prepared to listen to them!
For Associated Board candidates, maybe the extra few weeks waiting for the result is well worth it - at least you know you will have had a fair hearing!