These two girls were temporary cabin crew and both at the end of their service with the company!
They are back in the UK now since a few days. Obviously they had to go sick downroute but never informed any of the crew and claim that Medlink (the company which we report sick to when downroute) forgot to inform BA about their situation.
A boyfriend to one of the girls was also on the trip but he had to pay a full fare trip back to LHR as the girls staff travel concessions had been withdrawn. The girls also requested CW (Club World) on the UD when they checked in at DXB but the ground staff issued them seats on the main deck.
What really happened them? Nobody will probably never know but apparently some had seen them go out partying...