Just over month since the Crisis at Christmas centres closed, the Mayor has opened a city-hall funded emergency rough sleepers' shelter in Lambeth.
The centre is run by St Mungo's and provides hot showers, food and clean clothes as well as refuge from the sub-zero streets and a bed for the night. Support and advice is also available to help guests get off the streets for good.
All boroughs have 'Severe Weather Emergency Protocols' which kick in whenever three consecutive nights of freezing temperatures are predicted and a full list of London shelters is available from Homeless Link.
If you are concerned about a rough sleeper, you can contact St Mungo's outreach teams, who are working round the clock in Westminster, Southwark and Ealing to bring people in off the streets.
Support St Mungo's - make a donation online.