Certainly more luck than judgement, as someone who is disabled I'd certainly be giving 999 a ring or using the emergency button on the help point, although help points aren't always helpful, when I was trying to report a assit fail at a station the off shore call taker did not understand me, luckily I saw a platform dispatcher who assisted and tried to apologise for his colleagues failure.
Back to topic It is odd though that stations on the busy WCML are open 247 but Leamington your trapped. Although I am surprised it's not a more regular occorance, I was at a station recently waiting for the last train north on the MML and the staff member assisting me was the only one on duty was saying he'll be glad to be locking up & heading home, there definitely needs to be more thought to what happens in disruption as others may do stupid things just to get out.