There is a penal record on FindMyPast detailing that he received 5 years. There are several pages to the record giving a large amount of information which you may find interesting.It includes details of the crime, the court case, his medical record, various prisons, names and addresses of family members. Go to
https://www.findmypast.co.uk/transcript?id=TNA%2FCCC%2F2B%2FPCOM3%2F01451266 and select the option to view the original record. You need to click through about 12 pages of information.