Perfectly in line with Mr Butt's advice that the oyster is unseasonable in all months that do not have a letter R in their name, I have used my new Oystercard for the first time this morning. By which information you can safely deduct that I am in London again - until Thursday.
P.S. What's really great about it is that it's available without a UK address, thus for tourists and other London travellers. And that's a good thing seeing how the rates for individual trips have been hiked. It's not completely thought through, though, in that you do need a UK address to register the card to protect it against loss and top it up online.