London Time is the same as
Greenwich Mean Time less than half of the year. During Summer Time (Daylight Saving Time), London Time is
GMT+1, also known as
British Summer Time (BST).
The UK
clocks are back on Greenwich Mean Time (GMT) from 01:00 GMT Sunday
30 October 2011 until 01:00 GMT Sunday 25 March 2012.
Greenwich Mean Time (GMT) was established in 1884 at the International Meridian Conference, when it
was decided to the place the Prime Meridian at Greenwich, England.