You'll have to enter the building from the rear, there's a
staircase there that's not cordoned off by the fence that blocks
out the rest of the area. However, you'll hafta be real careful as
the stairs are full of leaves and algae, don wanna slip and
fall...
Anyway, the place was actually a Barracks for the British during
WW2, you can see the metal boot scrapers installed at the foot of
every building which the soldiers used to scrape mud off their
combat boots before entering the barracks...the last time i went, i
even saw a faded sign on one of the doors which said "OC's
Office"....there were crates of empty coke bottles inside...

Wonder what they wanna keep these bottles for...