The traffic is truly awful.
The M25 is closed between J23 (south mimms) and J27 (M11/stanstead). The tailbacks are as far back as J21 and J28 - this is in BOTH directions.
There has also been a stabbing (a young mum outside a school apparently ) in Enfield Town and so all the traffic around there is utterly gridlocked - ie near enough standstill - and the drivers diverting inwards because the M25 is closed is making it worse.
You probably know this already, but just in case....