I see on National Rail that the following solution is in place:
First Great Western passengers may use the following on reasonable routes:
South West Trains
Southern
Southern passengers may use the following on reasonable routes:
First Great Western
South West Trains
South West passengers may use the following on reasonable routes:
First Great Western
Southern
Looks like a bit of a 'circular reference' amongst the three
TOCs▸ affected? The main problem is that there really isn't an easy alternative route round this, by train you'd have to involve at least Guildford; and at this time of an afternoon spare buses must be at a premium.
Paul