Dear Jansen
My research for my ancestor Jacob Silverthorne led me to fact he had been arrested ,charged and convicted tried and sentenced at The Lent Assizes for Wiltshire.
In1993/4 I started my quest for information as to this incident ,non or hardly any on line records back then so everything was "manual." The court records then were Kept at The Public Record Office at Chancery Lane ,London WC2A 1LR.As I was unable to look myself I employed a researcher to look there for me,finding the relevant pages for my man ,the pages had markers put in them,and later photographed,called a"reprographic order"
I eventually received 5 xA3 Sheets of reprographs yellow background but very clear text all beautifully hand written.
My guy was sentenced to be HUNG for stealing a side of BACON!,however the sentence was commuted to 2 years HARD LABOUR.I can't find where he served his sentence or release papers if they exist,so make sure if you go down the same route you get everything relevant to the person you are looking for at the time. Sorry I can't remember the cost guess it would hardly be relevant to today.
Hope this is useful to you ,and good luck on your quest