Hello - In my opinion, this is not what is understood, usually, to be the colour of Bristol blue, which is a uniform dense rich blue, sometimes also refered to as 'poison bottle blue'. That's not to say this wasn't made at Bristol, and some might even call its colour by the name of the city, but it's the dense colour that is called 'Bristol', and Neil's piece is a good example of that sort.
During the C18, blue glass was produced in varying shades........from a very watery insipid hue, through to the deep rich blue we do associate with Bristol.
This was probably made as a footed sugar, and the folded foot might date it to the middle third of the C18 - but then again the folded foot was revived apparently in the early C19 - although either will qualify it for being Georgian
The striations are from hand forming with tools, rather than just blowing - is the rim fire polished Stuart, or cut and bevelled?