Hi Reg...read a couple of his books....Toilers of the field was good and the Southern County? was ok.
Brilliant at wildlife and country life but his books were more of a hobby....i like the fact that Williams LIVED his books and poems...worked in the hardship of the railworks.....thats not to say that Richard Jefferies was a great writer of Coate and the area around Swindon....he lived a rather lavish life style compared to Williams and so could get more books published but there is no doubt Swindon should be proud of him.
In fact Richard Jefferies sells many books in the USA these days....colleges and such love his work.
For the South Country, you might be thinking of Edward Thomas, a noted poet and writer, who perished young in the Great War....although not a Swindonian, his 1913 book The Icknield Way has a bit about Swindon in it.
William Morris is also worth a read for 19th Century Swindon history....quarterstaffs opposite The Bell, that sort of thing