I might be up for it - after all, the train south to Ally Pally starts from my local station! The problem is I am knee-deep in system testing at the moment and can't see far enough ahead to settle on a date. If the group booking retains the flexibility of day and gives a discount, count me in. Otherwise I'll see how things pan out and make a last-minute decision.
Last time I was there I came away with a new work lamp for the sewing space, some Ernest Wright shears (must have been just before the KickStarter campaign in that case), bulk purchases of cotton sewing thread in useful colours, and sore feet!
The week days are quieter than the week ends, despite being fairly stiff with textile student groups.