Can I shed some light on Harrods lists?
You walk around Harrods, say "oh, I'll have one of those, and 8 of those plates, and that cafetiere, and that £2000 stainless steel fridge please" and it all gets put on a list which the guests see. And say Great Uncle George buys you the fridge, then £2000 goes into a "bridal account". Good old George may think you get delivery of the fridge, but you won't. When the list is closed, Harrods will say "well done, you have a total of £17,200 in your account, here is an account card for each of you". Then you can spend the whole lot on very nice matching his and hers diamond studded Cartier watches, instead of a load of pillows, cutlery and fridges.
I know this because I had a Harrods bridal account. And 8 years later I still have something crappy like £70 I haven't spent and have forgotten about. They don't give you interest either by the way so I'm sure it helps their cashflow a LOT, unless you spend it all really fast.