It isn't all doom and gloom; in south-west London, Merton Police have tried to lighten the mood by tweeting a picture of two snowmen, dressed in police garb and a row of police vans with faces drawn in the snow:
Forecasters have predicted it could be the coldest March in 50 years. In 1962, average temperatures for the month were 2.8C.
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Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.