Only a small portion of short hauls from LHR will be affected. No disruption LCY, LGW or long haul LHR.
Impact of strike minimal.
From my point of view and I was caught up in this last year BA did a magnificent job getting me to my destination albeit at times not in the standard I would usually expect, however was well compensated with cash and miles.
My recent experiences of BA in CE and recently in NEW First have been superb. Especially when compared to the dismal offerings such as that which BMi currently provides.