Three teenagers and a man in his 50s died in the crash in Bolton, says Greater Manchester Police.
In his first interview since being sacked as the UK's US ambassador, Lord Mandelson also says he does not believe Donald Trump will take Greenland by force.
The Conservative leader says her party has started to offer more than "reflexive" opposition to the government.
Martin, a born and bred East Londoner, appeared as Charlie Slater between 2000 and 2016.
Milder conditions are expected after days of snow, ice and strong winds.