Stan
CAA view is that you should come to work expecting a full FDP + possible use of discretion.
I therefore cannot accept the Flight Safety issue you mention.
The problem as Fog states is that Pilot and standbys dont mix.
The only Pilots who like doing standbys are those that live locally and they treat them like a day off. In general Pilots dont earn allowances on standby so god forbid they have to use their salary to pay for accommodation etc