In a similar vein to what's going on with Southern, Virgin East Coast staff have voted overwhelmingly to go on strike, for what I assume is the same issue. Nothing is confirmed at the moment other than the intention, I just thought it would be good to keep visitors informed. I will try and add updates as more info becomes available, and recommend anyone post updates as replies if they find things out before I do.
Cliff Notes version: if you are planning to head to York, Leeds, Durham, Newcastle, Alnmouth, Berwick-upon-Tweed or Edinburgh in the future, your journey may be affected. Strike dates TBA.
EDIT: Strike dates are now confirmed - all day on Friday 19th, Friday 26th and Monday 29th of August.
EDIT 2: Strike now postponed as talks continue.