If you get the 2A, you directly pass it. If you get the 2C, it's a matter of your knowledge of the area - which, by your OP, sounds as though it's somewhat limited!
So from Park Lane, get the 2A. About 5 minutes before the bus is due at the Galleries, keep on looking out of the left hand side window. You'll pass it, and then seconds after, you'll see the Gala Bingo on the right hand side. You need to be pressing the bell as soon as you see the Gala Bingo, and walk back to the Care Centre the way the bus came.
