We'll get a look inside Heathrow's new Terminal 2 later. The £2.5b renovation project should be finished by June.
There'll be more natural light and partner airlines will be closer together to improve flight connections. Airport bosses say they're determined not to have a repeat of the chaos when Terminal 5 opened six years ago - with bags lost and long delays.
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A section of the M3 has been closed and bomb disposal units are at the scene after reports of "potential hazardous material in the road".
Largely dry with cloud and some sunny spells this afternoon with light winds.
Dry with sunny spells and light winds.