Ed Miliband has paid tribute to the "huge contribution" made by the Armed Forces.
His tweet comes as Armed Forces Day is being celebrated across Britain.
Today we recognise the huge contribution the men & women of our Armed Forces have made to Britain. Thank you. #ArmedForcesDay
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Seasonal rains have battered the country since late June with more than 150,000 people affected by floods and landslides.
The bus reportedly hit a tree near Russell Square.
Low pressure will throw cloud and few showers across the UK today, but it will also draw in very warm air from Europe again.