To be honest, HUD cameras are quite boring to watch after a while. You will never see the other a/c (except for possibly a quick flash), because he REALLY doesn't want to be flying in front of you. What you're really looking for is a helmet-mounted video, which means you're likely to be watching a test flight.
I doubt that you'll be able to get anything out of them, but Quintiq (formerly the Defence Evaluation and Research Agency - sort of an equivalent to DARPA in the States) at Boscombe Down do the majority of this type of flying for the UK. Their new website (quintiq.com) is poor - it advertises the agency as a consultancy rather than provides any useful information. However, it may get better in the future and you may be able to get contact names. Look for references to the Empire Test Pilots' School (ETPS).
Let us know if you do succeed!
The definition of a 'Pessimist': an Optimist with experience...