The table below outlines the number of external appointments made into the SPS for requested date range, detailed by establishment and role type (either non-operational or operational): Table 1 Establishment Non-operational appointments Operational appointments Total appointments HMP Barlinnie 10 39 49 HMP Cornton Vale 2 13 15 HMP Dumfries 1 10 11 HMP Edinburgh 11 26 37 HMP Glenochil 7 31 38 HMP Grampian 4 21 25 HMP Greenock 3 9 12 HMP Inverness 1 9 10 HMP Low Moss 7 18 25 HMP Castle Huntly 4 5 9 HMP Perth 5 23 28 HMP Polmont 9 22 31 HMP Shotts 8 23 31 Total 72 249 321 (b) Retention (turnover) rate of prison staff between 1 December 2020 and 30 November 2021, by prison establishment.