If this is a reliable timetable showing a service that we actually get, then it will be a major improvement over previous weeks, even if only one third of the usual departures from Harpo on Saturday. Is there any obvious and logical reason why four tph from Bedford on Sunday when the slow simply follows four minutes behind the fastest far as St Albans? I would have thought that these would be better deployed elsewhere, assuming drivers involved have suitable route knowledge. Still, I am sure that Thameslink know best.
The published timetable on the Railplan 2020 website has the service starting at Luton in which case the fact that it follows the faster train would appear to make sense - apart from the fact that the stock stables at Bedford and presumably Bedford drivers are involved there doesn't seem to be an obvious reason for extending the trains to Bedford (especially since they don't run 4tph north of St Albans in the Saturday timetable).