Currently, Free London travel, free uniform and as many Oyster wallets as I want.
I used to work, for a passenger boat company, who had a licensed bar but no stock system in place, so we used to help ourselves to booze, an unofficial perk if you will. Plus, doing night parties on the boats, you used to get a lot of drunken slappers willing to stick their tongues down our throats. I didn't mind that at all...