Ran two sessions, the second unfortunately had only two players which isn't ideal for an adventure which is essentially several people versus a small army. I think I gave the players too much help, and had NPCs do too much of the heavy lifting.
Trip there was fast and problem free given the distance (about 80 miles), trip back was dreadful thanks to speed restrictions of 30 at various points, and traffic almost at a standstill for large chunks of the middle 30 miles. No idea why, there seemed no obvious reason for it.
Anyway, I think I'll go again - but hope that next time the trains are running more normally!
The big London Dragonmeet is still on 28th november at Kensington Town Hall. There's also talk of a Dragonmeet Derby at some point (forget the date), but that's probably a little too far for me for a one-day event.