Just keep in mind that the daily menu choices are not that extensive and their ability to just "substitute" is limited. For example, if you don't like either of the 2 fish courses , there may not be any other fish to substitute. Normally there are just 3 "meat" selections and if you didn't like any of those, again there might not be anything else.
From our last meal at V&A--the meat choices were lamb, filet, and elk. If you had your heart set on pork or veal, you'd probably be out of luck. The fish choices were halibut and scallop.