Those Burtonwood calls must have been temporary relocation from Ringway, surely. Runway work?
When I arrived in T3 in late Summer 69, BA's operation had doubled to 22 a day: [* 707, otherwise VC10]
BA503 1000 JFK NAS *
BA071 1030 FRA NBO
BA501 1100 JFK
BA762 1115 BEY DOH DXB BOM
BA922 1130 FRA ROM DEL BKK HKG TYO *
BA561 1130 BOS DTT
BA697 1145 ANU BGI POS GRG
BA531 1200 JFK SFO HNL NAN SYD
BA308 1200 TLV
BA567 1215 YUL CHI
BA605 1230 PIK YYZ
BA669 1230 BDA NAS *
BA505 1300 JFK MBJ KIN LIM
BA509 1500 JFK
BA601 1515 YYZ *
BA507 1600 JFK
BA722 1615 ZRH THR KHI CCU SIN PER SYD AKL *
BA031 2015 ROM NBO JNB
BA051 2145 CAI NBO LUN
BA792 2215 BAH DEL KUL SIN
BA011 2230 EBB JNB
BA281 2245 ROM KAN LOS
Note the nice lunch and tea breaks for the check-in staff