Hi Si,
We have allocated 40 places per date as this is a new tour (about 2 weeks since it was launched), there have only been a few bookings for each date.
Our team would review this about 15 weeks before departure to determine whether or not it would operate but we'd look to have about 15-20 travellers on each date. I was told that we are running a similar tour on Travelsphere which was launched a month earlier - they have already added an additional date after one of them sold out which is usually a good sign.
Kindest regards,
Julia