Fascinating stuff - two up and two to go of a TV series covering a Perisher Course.
It may not be universally available, particularly from outside the UK., but try demand5 at
http://www.channel5.com/shows/submar.../episode-1-336
Next 'live' parts at 2000 on the 28th.& 29th. June.
Summary:-
Part 1. Periscope ranging and special ops.
Part 2. Reconnaissance photography, pursued by a warship and Merlin helicopter.
Part 3. Taking part in a NATO exercise.
Part 4. Final Test with 'brass' spectators.
Enjoy........if you can !