I am rather hesitant at being the first ( Damn - Beagle beat me to it --- amend to second) to reply on this post; because I went in the '96 redundancy scheme; however here goes:
In my experience as a VIP Captain we told them of a change of requirement and what we proposed,to accommodate the revised requirements of our Pax, to do. Almost invariably our proposals were agreed.
If, however, you present them with a problem and expect them to come up with a solution - then YOU have a problem. Command, Group and Sqn Supervisors will have to discuss the way forward and agree a plan - by which time you will be out of crew duty time.
Ascot Ops are there to help you - but you must help them to help you.