Fascinating place, especially if you can get onto the flight deck of the Sandringham. They (used to) open it up occassionally. The SUMPAC is interesting; no chance of it flying, but a good effort pre-kevlar.
If you're still in SOU, I recommend a visit to the maritime museum which is not far away. Among the exibhits is "Miss Great Britain III", which at one time held the world water speed record. All aluminium , gleaming steel and brass.