US and UK bed sizes differ slightly, except for Double/Full, enough so that if you bring US sheets to put on UK beds or buy UK sheets for a US mattress, the fit may be off just enough to be annoying.

Here is a US v UK bed size chart from information on Wikipedia Bed Size:

Of all the issues in moving to the UK, Transportation must be one of the most painful.

The United Kingdom is a constitutional monarchy, and includes the countries of Wales, England, Scotland, and Northern Ireland. The full official name is: United Kingdom of Great Britain and Northern Ireland. The constitution is unwritten, and the laws consist of partly statutes, partly common law and practice. For more detailed information and statistics, check the CIA World Fact Book.

There are as many, if not more regional accents in the UK than there are in the US. The history of the English language is quite interesting once you start to dig.

The structure of the education system in the UK is a bit confusing to a parent moving from the US, it is slightly similar to the US system, but in many ways very different.