Seems to be SEN 4x weekly, BHD & DUB 5 x weekly.
SEN is very much timed for leisure travellers with a great schedule for a weekend away (or perhaps a working week in London).
DUB would seem to be nicely scheduled for onward connections.
There are no flights at all on Tuesdays and Wednesdays, it seems as though the operation has been set up to be undertaken by a single crew.