It amazes me that they still claim this but refuse to publish any figures. If they had a case they'd just have to say "Here's how many conductors we had available on this day, here are the figures from last year" and the RMT would be instantly cast in an incredibly bad light if it were true. The...
Due to the transport levy, the club presumably has a contract with Southern which details service levels etc... Hopefully it includes hefty financial penalties if Southern don't hold up their end.