I suspect it will be every day they can get staff.And today as well.
It is interesting how they can staff that but one morning had to cancel some trains from Epsom due to a lack of staff. Obviously contingency guards wouldn't know the whole network and I don't t know which type staff were not avilable.
I wonder which is the more popular stretch of line in terms of passengers, Guildford to Aldershot or Aldershot to Ascot? I'm suspecting the latter but I don't know.