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Can't see many using BA from LHR to connect at MAN (It's the only BA flight out of MAN)
Make absolute sense actually due to the JV- they can be considered effectively BA flights and has been in the case for the Chicago operation for nigh on a decade sharing lounges for those so bribed !
By the way our friend LHR-LHR certainly asserts some over bookings out of LHR have been routed north at times.
As for Cathay its well known that don't exactly see eye to eye with BA on the UK - HK routes - They may be in the same alliance however they are very much competitors.