BA HAVE just reduced the crewing levels on the 767's. 6 ex main base, 5 home.
There is a stack of OMN's re SEP changes on ESS.
Bassa may say this is because BA are having problems. An alternative view is that the 767's were mostly canx, no VCC's, smallest longhaul a/c. WW has promised to fly 100% of the schedule, maybe he's planning to do this with fewer crew?