With almost all services calling at Habrough from a week on Sunday, how much use will this easement be? (I'm not an expert on ticketing so sorry if I have missed something obvious)
The easement has been in a long time, just has changed form. The main benefit is for people from the west wanting to connect into the last Barton train, as the natural TPE connection is the one which continues to not stop at Habrough, hence on weekdays such passengers would otherwise have to change at both Barnetby and Habrough and on Saturdays would have to set out an hour earlier, with a long interchange time at Habrough.
Additionally, were the connection at Habrough would be longer than 25 minutes, doubling back to Grimsby would be preferable to many rather than waiting at Habrough with its lack of facilities, especially on poor weather days.