Thursday suits me for sure. Meet at 'Paradise' in Dunmow High Street for a start around 09:00-09:30. I'll be there for breakfast around 08:15. That means we'll get to Haslingfield at lunchtime, then have time for a cuppa at the next control in Buntingford.
If anyone is riding on a Boudicca 100km brevet and not a DIY, then it would save time if you bring a completed AUK entry form (generic entry forms are on the AUK website), though I'll have some with me too.