On Wed, 19 Sep 2012 14:28:10 +0100, Peter Masson wrote:

You have to pay a GBP 5 deposit when you get an Oyster card, as well as the
credit you put on it. This stays on, as well as any unused credit, if you
keep the card for a further trip to London, though you can get the deposit
(and any unused credit) back if you hand your Oyster card in.

Thanks, that info is not so obvious on the website but on there somewhere I
presume.
So I drop into the newsagent by H&H buy an Oyster card & ask for £20
credit, I go do my travels & use £12.80 as I calculated, I then return the
Oyster to the shop on my return & get £7.20 back along with my £5 deposit?

CD