The DC-3 was most likely Autair's G-APPO
Thanks for correcting that cj. I had completely forgotten that livery - imagining that BMA went straight from the vertical BM to the jet livery you mention-which I remember coming in in 1970 with One Elevens.
That just leaves the Britannia to sort out which looks like a British Eagle one, awaiting a new operator or the breaker after they stopped operations in autumn 1968.