I accept that these CC have to report for duty rested. So, my observation is:
If it's worth using up 14hrs flying from HKG, then a day rest - in order to get to to work? Then they are being paid way over the odds. To be able to use up two days to do a sequence of sectors? (that is, HKG-LHR, rest, work + rest,work rtn LHR to HKG) They MUST realise that that is a pattern of work that no employer can support through the worst recession since the depression. Yes, living near EGLL is expensive but that is a very funny solution.
If you think this only happens at BA you will be in for a surprise.
To many it's worth to commute as they have their families and homes somewhere else. It's every commuter's own responsibility to get to and from work and BA has little tolerance if they get late to work because their commuting flight is either late or they didn't get on it because it's full.
BA has also occassionally used "commuting" as part of their recruitment drives, especially when they were recruiting for language speakers all over Europe.