Hi Vera,
I have to thank Arranroots for sending me a link to you. My Great x 3 grandfather was Joshua Stevens who along with brother Robert was transported to Tasmania during the 'Swing riots'. I have some information on the family although I can't help with Thomas senior. Do you know whether Robert returned from Australia after he was granted his pardon? If so what happened to him? I also have the Robert, son of Thomas, as being born c1760 as the baptism records show 08/07/1760 in Northleach. If that is true maybe Thomas was born there, Other information I have is that Robert senior's father was called Edward and his mother was called Mary. Obviously some confusion here, can you throw any light on it? Any further information you have on the family I would be grateful for and if you have any questions that I might have the answer to please let me know.
Best Wishes
Alansdad