I agree with the M11, M25 anticlockwise, M3 route and you might be lucky if you can get on the road before 3.30pm, any later than that and forget it. Park in the services, have a meal, read the "free" Newspaper, stretch your legs and wait till after 7.00pm. You might as well wait there rather than being "trapped" in your car 20 miles down the road. Unless there is an accident or other unpredictable hold up the rest of your journey should be relatively smooth and get you to your destination before everyone goes to bed!! Good luck.