How often will you fold it during the day? Is it 11 miles each way?
Plenty of people commute on an Airnimal Joey, but I wouldn’t want to fold it at work then unfold it again. I’ve had a Brompton and now have an Airnimal Rhino. I’d ride 11 miles on a Brompton (in fact I rode 200km on one), but the Airnimals are faster.
Birdy’s are nice, as are Mezzo’s. The Bike Friday Tikit has a longer wheelbase which I think will be more suited to longer distances and can be rolled more easily than the Brompton. Fold is not as small.
To be honest, could you not just lock something up in London for when you step off the train?