The rear dropouts look like they are from late 70’s early 80’s
Certainly could be but I'd want some positive proof it was a Gillott especially for that money, like a frame number or some provenance. You notice the seller is careful to describe it as "Gillott badged".
Might not be a Gillott, but that’s definitely a very nice MGA in the background
Nothing.... I posted in the wrong placeWhat had this got to do with the OP?
Looks quite Holdsworth-ish to me. Reading classic lightweights suggests that the Gillott name was owned by Edwardes by this point who brought in and badged up frames from other sources.