I would have thought that business trips could be accommodated around a 5 x weekly schedule in most cases, providing perhaps the 2 non-op days are not consecutive. But heaven help us if there are ignorant and inefficient agents who assume there are no direct flights just because there happens to be none on a particular day or have a vested interest in routing their clients through London.
A service which is only 4 x weekly is more marginal I admit for business, and it would be interesting to know just how many business travellers are not using CX's non-stop flights to MAN both ways or indeed are still using LHR when MAN would be more convenient geographically. Given the high LF's on HKK and freight carried, it's been disappointing that CX so far have not managed to squeeze even 1 extra weekly flight for the MAN route.