Biggles
Not taken in the mid 70s, well, not all of them anyway. The picture of Bell 212 BJJO shows it parked on the "new" North Denes ramp area which was not constructed until 1989. G-BJJO (along with G-BJJP and G-BJJR) was purchased new in late 1981 to replace the Wessex aircraft contracted to Amoco after they were grounded due to the fatal accident which befell G-ASWI in 1981 off Bacton.
Thanks for the pix though.