Because there's been quite a bit of confusion on the topic...
BST is British Summer Time, and is what is used in Britain atm. It's GMT +1.
So, currently we have:
Light Blue: GMT (Greenwich Mean Time) = BST -1
Dark Blue: WEST (Western European Summer Time) = BST
Light Red: CET* (Central European Time) = BST
Dark Red: CEST (Central European Summer Time) = BST +1
Green: EEST (Eastern European Summer Time) = BST +2
Yellow: MSD (Moscow Daylight Time) = BST +3
* I doubt they call it CET in Algeria, but whatever.
The time of the event is 20:00 BST, which equals:
GMT = 19:00
WEST = 20:00
CET = 21:00
CEST = 22:00
EEST = 23:00
MSD = 24:00
Hope it solves some of the confusion.