No excuse at all , because obviously I always carry a laptop around
with me wherever I go. Why didn't I think of logging on when I was
standing in that bus queue? Must've just slipped my mind.

No excuse, because judging from your posting frequency you obviously
have an Internet connection around the clock - and may be it's about
time to start using it for something useful, don't you think?

P.S. Oyster website works from mobile phone too - no need for laptop.