Visited with DannyDay999. Access was simple and the site is massive, probably the best place I've been so far (barring Pilkington!)
There are a small few people working on the site and apparently some of the hangars have been rented out. While we were there we saw 2 cars driving up and down, who spotted us more than once, and also a big truck parked up, so had to take a few evasive maneuvers, but in reality the place is so massive and there's so many buildings, that even if you were spotted you'd easily be able to hide from them, just like we did.
Had a run in with a local just as we walked out who rambled on, saying that the land was owned by Investatec Bank and they press charges against anyone who was seen on the grounds (yeah right), and that, as an employee of the almighty corporation, he'd took a solemn oath to call the police on anyone he saw trespassing, but kindly told us if we f**ked off sharpish he wouldn't... bless him!
Sorry for the huge amount of pictures, I had that many favourites I couldn't bear to delete them. Also apologies for the worlds longest intro!
Thanks for looking!