A total lunar eclipse occurs when the Earth passes directly between the Sun and the Moon. At totality, the only light reaching the Moon has been refracted by the Earth's atmosphere which causes the Moon to shine in a deep copper colour. This deep red colour is caused by light absorbed and reflected by the atmosphere - the same as when you get a red sky at night. Fred Espenak has a great article on the science of a total lunar eclipse on his website if you want to know more.
This was my first total lunar eclipse, so I was a little unsure what to expect. Like any other eclipse, the event started with a small chunk taken out of the edge of the Moon which slowly grew to cover the entire surface. It wasn't as eery as a solar eclipse, but a copper-red moon was different.
The next eclipse from the UK is on the 21st of February 2008.