I'd say no chance of it running from London, based on the LNER website service updates. When I looked a few minutes go it listed in the region of 50 cancellations, and was suggesting passengers defer travel until tomorrow (Sunday) if possible.
It might start at Peterborough or somewhere further north, but getting to Peterborough from London by any means other than the A1 I'd say is a non-starter. York via Manchester (Avanti and TPE, subject to ticket acceptance of course) could be an option.
Either way, good luck.
There is fairly comprehensive ticket acceptance in place according to LNER’s website: Avanti and EMR from London, TPE, XC and Northern further north.
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