Compatibility of Prison Officer and Reservist

I have accepted a provisional offer to be a prison officer and am also mid way through the process of joining the RAF Reserves. Has anybody successfully combined both? Most organisations in the Civil Service offer 10 days additional paid leave for the mandatory annual component of the reserves with the remaining 17 days taken at weekends or as annual leave. Is this the case with the prison service?

A google search shows a headline from 2013 suggesting a government initiative to promote the reserves within the prison service was blocked for safety reasons. Whereas the same search shows that in 2018 HMP Wandsworth (not my choice of prison) signed up to the armed forces covenant.

I have emailed the MOJ with this question, but was told that the question would need to be asked at the time of the onboarding interview with the specific prison.

Any thoughts or insights are appreciated.