Just to update everyone and apologies for the very late update!

An agent met us when we landed in HKG (Gate 17). We did miss the flight to LHR and was rebooked on CX251 the same evening with a meal voucher at the Regal Hotel. We didn't use them as we went to the City and had lunch there instead and ate in the Pier First for dinner instead of the hotel. Top notch service from CX as always.