Just thought I'd post this in case it gives people ideas for creating backup plans. I would preface this by saying that I know I am extremely fortunate to have access to lots of miles (on both BA and CX) and credit, which creates options that otherwise wouldn't exist.

Was supposed to be flying to BOM on Fri eve but after that flight was cancelled, along with the 139 on Sat morning I was waitlisted for and the 199 on Sat eve I had a confirmed seat on (1A :-(), have given up and am trying to get to HKG directly, which was the next stop on my itinerary. For various reasons it is really important I get to HKG.

I managed to secure a J-class redemption flight LHR-HKG on CX for 21/12 and on BA for 23/12. As of about an hour ago, BA still had availbility for both 23/12 and 24/12.

In addition, CX seems to have good J-class redemption availability on CDG-HKG for several days this week (also as of about an hour ago) and I have booked CDG-HKG for the evening of 22/12.

I am getting increasingly bearish about LHR's ability to recover this week given that sub-zero temperatures rather than snow seem to be causing the current issues. So if the LHR CX flight on 21/12 is cancelled, I am planning to head to Paris early in the morning of 22/12. Business Premier tickets on the Eurostar are fully refundable up to 2 months after the departure date. I know that the trains are disrupted too, but I have a buffer of about 10 hours which I hope will be enough to get to Paris in time for the CX flight, and I expect having a Business Premier ticket will give me some degree of priority with Eurostar.

Of course, CDG may be disrupted itself on 22/12, in which case I will either try to get rebooked from CDG on CX, or else come back to London on 23/12 and try to get the BA flight- so I have booked another flexible Eurostar ticket back to London from Paris on the morning of 23/12. I should know what is happening to the CX flight from CDG in time to cancel my BA award flight on 23/12 without penalty if necessary. Similarly, in the event that my CX LHR-HKG flight on 21/12 runs, I will cancel my CDG-HKG flight in addition.

Sorry if this is too detailed and boring but just thought it might be helpful for someone.