Whilst working on the lead/trail time addition to bookings we discussed how they should affect things. In the end we decided that they should work in combination when placing bookings so the window of unbookable time before a bookings should be the previous bookings 'trail' period + the current bookings 'lead' period. I've run out of capacity to make that change in the aforementioned bug, so I'm splitting it out here to work on that as a expedient follow-up. Lets get the core functionality in and then continue to polish it. A- | TA >|< LB | -B- | TB >|< LC | -C