Great news @pointythings! Well done your DD.
Made it back home. Only took 5 hours 
Lots of rain to start with, although it cleared up as we got nearer to London and as @LlynTegid said, far fewer lorries. And then we hit the M25. Going from the M4 junction to junction 10 took us 90 minutes. FFS. Anyway, almost time to open the bar.