Heads-up that there are fresh strikes proposed on LNER affecting weekends from 31 August to 14 November. (Weekdays are unaffected, as are other operators.)
It’s likely that they will run a reduced service on the core section of the route (London-Edinburgh, and probably London-Leeds). Expect reduced frequency and fewer early morning/ late night services. And the occasional late-notice cancellation.
You should also expect no LNER services north of Edinburgh, or to the secondary destinations (Lincoln, Hull, Middlesbrough, Sunderland, anywhere beyond Leeds).
All these destinations can be reached on other operators, who are not affected by the strike.
It’s a very good idea to make a free seat reservation, and to double-check exact train times on the day of travel in case of changes.
LNER strike page: https://www.lner.co.uk/travel-information/industrial-action/