This morning ASLEF (the train drivers union) has announced new strikes on LNER every Saturday and Sunday from 31 August to 10 November.
The effects are obviously yet to be determined, but some type of basic service can be expected to run (but no LNER trains to Inverness and Aberdeen). However it may be impossible to run trains between Edinburgh and Newcastle in September as services are diverted via Carlisle due to engineering work, and there may be insufficient other drivers with the relevant route knowledge.
Other options are LUMO from Edinburgh and Newcastle, Grand Central from York and Doncaster, Hull Trains from Doncaster and Trans Pennine Edinburgh to York.
Also Avanti from Edinburgh to London Euston.
There is always a chance that negotiations may lead to the strikes being withdrawn.