If you're entering the original main entrance, (tower block) follow the signs to the lifts, you'll go past the shop on your right, and the Chaplin on your left. Just before the lifts, turn to your left, follow round past the vending machines (if they're still there) then take the first left, it should be sign posted for pharmacy. Carey on down this corridor, just before you reach pharmacy, you'll find a staircase and lift, on your right, these will take you to Mayhill / DSU. If you reach Edward Jenner before the lift, you've gone too far. Hope this helps.