Samuel Colt at one point had his manufacturing plant located in the UK. I would imagine Colts - all types - were always very popular items there.
I have also heard that the Colt company will send you some information about any Colt pistol for which you can provide them a serial number. (Probably just stuff like date and place of manufacture, and to whom factory-shipped. Your chances of finding any info about a given pistol after that point - unless it were owned by Wild Bill Hickock, or some such famous person - would proabably be about nil).
I have also heard that they charge a fee for doing so.
Jim