Geography, U.K. and U.S.
|I've never had a particularly good sense of the size of England.|
If you too have had this problem and you are more familiar with the states of the U.S., here are some comparisons you can use:
Or, if you prefer, you can imagine the British Isles as Louisiana poised below South Carolina, flanked by New Jersey to its west and a second South Carolina floating above it to the northwest (but this one with Connecticut on its northeast coast), all of which fit inside the borders of Michigan.
Update (to appease the pedants): It seems my reference to "Ireland" wasn't as clear as it could have been. So here's another try.