The only thing you can do when you're visiting Harrods is to take a look around. I mean, everybody know about the prices of this super-extra-expensive shopping centre. When you are inside of it, it's a sort of Breakfast to Tiffany. You can only take a look. It's something like "I'm into the Louvre. I can only look around and choose what I like the most. Without touching anything" :)
And if you are hungry, believe me, do not come inside the Food/Chocolate/Bakery stores.
I mean.. These cakes look like "made in DisneyLand".