I'm actually a little surprised that your request for the recordings was actually fulfilled, and not ignored, diverted, blackholed, responded to with "oh we lost those recordings", etc. Well done!
It's actually one of the things that they're legally obliged to provide in response to a request for info under the Data Protection Act. If they didn't comply with my request within 28 days, they'd have the regulator to answer to...and we all know how fearful a prospect that could be :-/