Having been in Business Travel for 40 odd years I have seen many changes but the biggest has been the emergence of the Arab carriers and their services worldwide through their Gulf hubs.I book far more travellers,both business and leisure.through DXB,DOH and AUH from MAN (and NCL/BHX inthe case of EK) to the expense of LHR.two reasons 1,Terminal changes in LHR and a general litany of delays and lost baggage
2.The very good on board service on the Gulf carriers
Of course we also still use the Provincial connections of KL,LH,AF and LX
through their European Hubs and Westbound the US carriers flying directly from MAN,GLA and EDI not forgetting BD out of MAN to ORD and onwards on UA.
Heathrow is only used as a last resort