Are weekday service levels that different from Sundays on most lines at the moment anyway, especially once you remove everything before 0730? Certainly Reading and Windsor have virtually identical service levels all week.
Yes. Haslemere to London is 3 trains an hour instead of 2 off-peak. In the peak, it is 4 an hour. Guildford to London via Cobham is 2 an hour instead of 1.
Then you have the peak extras, which seem to be running as it's a week-day timetable. Of course, it starts after 7:30 am, save the rail replacement bus running before 4 am from Guildford.
There will be other differences I'm not aware of but definitely more services. Of course, if one wanted to go from Guildford to Clapham Junction, it's better on a Sunday but that's due to the timetable rather than the number of trains running.
When one considers what GWR are doing, with some services not running and with Govia Thameslink Railway running a Sunday timetable, it's surprising. It is very good that they feel able to so this though
GWR is advising people to only travel on Thursday if absolutely necessary. In contrast, SWR says nothing of the sort. Just that services will be disrupted and busier than usual.