I was checking tomorrow's timetables (Saturday, 22/1) for engineering works.
Seems like the Guildford stopping service (via Effingham) is down to 1 tph on Saturday, i.e. 1 tph between Guildford and Raynes Park.
From 4 tph pre-covid to 3 tph post-covid to 1 tph this Saturday. No SWR services to Dorking either.
Surprisingly, this is worse than the Sunday engineering timetable (23/1), which has 2 tph on the Guildford stoppers (which is also the usual non-engineering works frequency)
So I'm expecting the Southern services from Epsom/Dorking to London to be rammed this Saturday, especially the pre-lunchtime period, i.e 10am-12.