Opinions requested - in two weeks time on a Thursday my family will be
coming to visit us, and will be driving from Heathrow Airport to
Walthamstow, starting out from Heathrow at about 15:30.

I guess the two obvious routes are M25-M11 or A4-A406-A10. What do you think
would be quickest at that time of day? Typically, how busy are the two roads
main roads (M25/A406) then?

Thanks in advance,

Andy.