You may want to purchase a small receiver that picks up the Airband. If you live within (about) 10miles from an airfield or airport then you should be able to hear both sides of the conversation, or failing that if you live a little further away then you'll atleast be able to hear the pilot calls.
I got a double CD from the pilot warehouse and found it really poor. The same chap is doing the commentary, the air traffic voice and the pilots voice. It's so dull. It's ideal if you want to nod off - I almost did after listening to it in the car. To make matters worse, each CD is just one track, so you cannot go back and forth to sections of the CD without pressing the fast forward through all 60 minutes...
I've just been on a Radiotelephony course with Malcolm Dobson. He's an absolute star. I notice that you are down south though, but he's based in the North West.
If you can get yourself on some ground school course for RT then I can thoroughly recommend it. You can then get through any RT mistakes infront of others and then get over any embarrasment that you would otherwise have. Malcolm's course was a two day one, done over two weekends, the theory exam done on the second day and a seperate slot for the RT practical - there should be similar courses run nearer to you (especially with the winter months coming up).
Tiggermoth