If you're in Command of an aircraft anywhere, anytime, you should be paid for it. It's not a flying club (sic) and what would the CAD do if you were to hit something whilst engaged in 'free' operations? Perhaps, if you fancy a quick flight on a nice day you could do it for nothing. Maybe it is becoming a Flying Club after all.
What are these people on FFS???
Anyway, is it in your contract of employment? No - didn't think so.
Don't do it.