The funeral of a policeman killed while carrying out routine speed checks in south London is to be held today.
PC Andrew Duncan was struck by a hot and run driver whilst carrying out routine speed checks in Sutton.
A man has been charged with causing death by dangerous driving in relation to his death.
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The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.