So, DS1 has an interview starting at 11am at Imperial.
He will be coming from Cambridge way, so getting on the tube at Tottenham Hale.
It's the Central Line that will be closed and he's not on that line, but of course the rest of the network will be very busy.
He's fine travelling around London, but we have little experience of doing so when there are strikes on.
How much extra time should he allow?