Not everyone will have access to the Internet and not everyone uses Twitter
Couldn't agree more. Twitter actually has quite a small, and falling, userbase. Unless a user chooses to subscribe to a medium largely full of things i really don't wish to read, they won't read them.
And note: i am an IT power-user. I work with computers all day some days, and configure from scratch But I don't use social media, because there is so much tripe and so little useful content. No social media is, IMO, a medium for important communications!
So (I hear you ask), what's the alternative. Well...when I book online, the operator (or ticket issuer) gets my email address, know when I have a reservation, and it'd be reasonable to take my phone number in case of an issue. So the operator has a link to a lot of customers in SMS and email. This relatively old tech is robust, reliable, and covers a wider customer base. I appreciate there would need to be some information passed between ticketing and operator, but that is not unreasonable if used for strictly operational purposes.
Yes, this will not cover everyone, but it is widely useable, is targetted, and works much better in the common case of intermittent internet / phone network access one has when travelling in the UK.
For such events as this, major disruption, I would not object to everyone on the ticketing database receiving a txt & email. Better than a flood of marketing and twaddle via social media. (and better than being stuck in a flood...)
Oh, and above all it is _simple_.
My 2p-worth. Perhaps it's unfeasible, perhaps useful.