The three times I have been to London (1987, 1994, 2004), the crosswalks were almost always marked something like “WATCH RIGHT” (or “WATCH LEFT” if it was a one-way road from left to right). Speaking of which, note that, unless the law has changed and I missed it, there is no such thing as “pedestrian right-of-way” for jaywalkers.
And isn’t it, “Mind the gap, please”? (Back in 1987, it was a man’s voice almost yelling, “MIND…the GAP!”; in 2004, it was a rather pleasant female voice saying, “Mind the gap, please.”)
For those of you wondering what we are talking about, “the gap” is the space between a subway train and the edge of the platform. (Those of you in the San Francisco area who have seen the “Watch the gap!” signs on BART know what I mean.)
I have always heard that, while you should have some foreign currency with you when you land for some unforeseen emergency, you should do most of your conversion in the country to which you are converting (i.e. dollars to pounds there; pounds to dollars back here).
Speaking of converting pounds back to dollars, you might want to ask whatever bank you use here if they will convert one-pound and two-pound coins. Normally, only currency can be converted, but recently “high demonination” coins have been converted as well.
Also, consider bringing at least one ATM card - but keep in mind that some banks will charge you even if all you do is check your balance from a foreign ATM.