Re Invicta, they usually had three based Vanguards during the summer mainly parked on the pond (stand 16). As mentioned they did pilgrim charters to Lourdes and also did a series of flights to Dusseldorf for the families of servicemen stationed in Germany plus late night flights to Basle for a tour company maybe Blue Cars?.
I remember one summer Sunday evening - I think 1972 - with the cloud on the deck and raining hard watching an Invicta Vanguard do an overshoot from less than 100 ft and left of the centreline and then flew staight down the runway at the same height with the co-pilot (presumably) saying ´Invicta 191 didn´t quite make it' (191 was used as a positioning call-sign) and round for another go and landed safely at the second attempt. Just before this an Il-18 of Tarom had made a perfect approach and landing!