London bookings going through roof

Is there something in the water in central London? Our 30-day average bookings-taken-per-day metric has leapt nearly 25% over the past month or so (see graph; y-axis units hidden, to retain a modicum of commercial confidentiality).

It hasn't taken us completely by surprise, we have been doing one or two quiet little bits of new marketing, but it is pretty amazing, nonetheless.