The simple fact is that if you’re advised not to travel on that date. You make other plans. If you stay in a hotel that night it’ll be covered. If you go home the next day your ticket is valid. If you use other TOCs trains the next day you’re covered (any costs incurred will be refunded). If you decide to travel, any additional costs are covered. For all the negative points we can say about LNER from vast experience in these situations where there is serious disruption they don’t faff about, they do actually have the customer as a priority. Of coursed YMMV as there will be exceptions where they haven’t got it quite right but it’s unlikely they’re going to refuse someone a room in premier inn king’s Cross. Just because things improved towards the end of service.
You make it sound so easy!