That time on a Sunday should be OK from a traffic volume pov.
There are road widening works on the M1 all the way from MK to Dunstable - 15 miles or so at either 40 or 50. Also another long stretch on the M25 just north of the Dartford crossing. Sunday is also a favourite time to do maintenance on the QE2 bridge with southbound traffic using the east tunnel bore at Dartford.
Provided you keep your ears cocked for traffic bulletins on the radio and watch the gantries you should be OK though. In event of probs on the M1 A14/A1/M11 is a viable diversion and I think there's also a fast M1/A1 link recently opened south of MK.
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road congestion 
road congestion 