Let me remind you how BA pilots assisted as strike breakers in 2010, which directly led to the formation of Mixed Fleet.
If I recall correctly in 2010 WW gave each department a savings target and imposed a deeadline along the lines of 'reach agreement by xx date or I will impose changes'. BASSA, in their true 1970s style had a mass meeting at Kempston Racecourse and on a show of hands voted for 'no more negotiation'. All the other unions negotiated their departments savings.
WW was the first BA CEO who said what he meant and meant what he said. MF wasn't even on the table at the time, he wanted things like the ludicrous Disruption Agreement. For those unaccustomed to the agreements made when BA was a nationalised industry, in a nutshell, an example would be a Singapore London flight might divert to Manchester due fog. The CC would have to have two local nights in a hotel in Manchester before positioning back to LHR where they would then take their 'minimum base turnaround' days before being avilable for work.
WW must have thought all his birthdays had come at once because he promptly introduced MF while BASSA demonstrated their stupidity. When the strike was settled it was a joy to see BASSA claiming that the return of the strikers suspended staff travel as a victory.
As it happens I thought that pilots working as CC during the strike was foolish given the inevitable antagonism this would cause when eventually everybody was back at work after the disruption.