Woo Hoo! I hope that you and your children will like it....If you don't I hope that you won't be upset with me :-) Your order was around a dollar less than mine which is because the stoat cave is over on the Left Coast....pretty reasonable for a transcontinental difference.
The pound is down, or is it up? I usually use $2/pound as a rule of thumb conversion.
I haven't been following it too closely lately, not being in the financial industry. I've usually used the same rule as you do and it has normally been pretty close, at least in my recent experience.
I consider $18 for a cool map to be very reasonable, unless there’s a problem with the quality. Another way for the Offspring to puzzle the general public ... along with talking about aliens as if they’re as obvious as turnips: “Of course, Richard III was a Goa’uld; probably Baal, same sense of humor, and look at his nose!”