Hi Ben,
I know this subject has been raised before, but here is a further thought. The river cruise in Portugal on 2nd (?) April has been removed from the site, and no reason given. If it has been withdrawn due to lack of interest, fair enough, but if it is sold out, then wouldn't it make sense to say so on the site? Seeing tours mark as sold out, or fully booked, might encourage others to book before the tour they are interested in vanishes, and would leave the details available to those who have booked available until the paperwork arrives.
Just a thought.
Sylvia