Correct me if I'm wrong but making money from a Clips & ATC from LHR isn't the wisest idea. We've all heard of Jon5700 from youtube? He was going to do so with SXM and another Airport but the fact is if BAA found out you were selling a DVD with their Airport and NATS Comms they would be on you to either stop or Tax you of some sort. It has to do with a few laws apparently etc! Not being a troll just a heads up, I was going to do the same with Heathrow but I didn't for this reason. Spoke to BAA Media and they said it's true but hay not saying don't just saying be aware. I wouldn't recommend Blue-Ray either unless you have a 5,000 Grand Camera with Crisp Air Traffic Control Comms & the fact Blue-Ray isn't quite worldwide yet! I would recommend you not record the ATC from your Camera mic, better to get a proper Audio recorder and film separate! You will get clear ATC that way and simply add it to the video.
This is just my advice though as I know how BAA are, I've been in trouble with them before on the Filming side but that's a story for a different day ha.