UK edition of Monopoly - The Mega Edition, published by Winning Moves.
The additional properties in the UK edition are as follows:
Brown - Elephant And Castle
Light blue - Edgware Road
Pink - Downing Street
Orange - High Holborn
Red - Aldwych
Yellow - Shaftesbury Avenue
Green - Savile Row
Dark Blue - Knightsbridge
and there is also Gas Company in the Utilities set.