It is an amazing place to visit, first time I went there was in the 90's as a teenager and was in awe at the size of the place, last time was about 2003 as I worked just round the corner and was still in awe, the ropery in itself is huge.
Never managed to get onto the ships or the Ocelot, although I was there when it came back to Chatham, have wanted to go back down and have a look, one of my old friends runs a business at the Admirals offices there so it has always been on my list to catch up next time I'm there.
If you walked round the whole part, you might have recognized filming locations from a whole host of films and TV shows too.