It is really spooky indeed, every other time I walk into the Admirality Foyer in Marleybone I spy something really spooky. I see a dog walking across the air right before the war room!

Clearly Marleybone needs to hire a ghost hunter :P

When you enter the Admiralty Building, go up the stairs to the right. On the wall to your right there is a painting - look carefully and you will notice a spooky glow coming from within the painting.
( This is caused by accidently placing the painting over two wall sconces. You can see similar sconces around the walls. )
"Who you gonna call?"
I must say I haven't seen the "floating Marleybonian" yet.