With LHR being hit by a strike next week, 177 flights are reported as cancelled, and airlines are said to be rebooking pax. Is that likely to help if there's a shortage of firefighters, security staff and engineers?
If it means rebooking pax on consolidated flights, or services from/to LGW/STN/LTN/LCY, or even (for UK domestic pax) the train, then yes it probably helps a bit.