Steve, unless the road lighting laws have changed fitting your running lights around the fog light grilles will render them mostly useless. The law is that any light fitted with its centre closer than 500mm to the road surface can only be used where conditions reduce visibility to 100m or less, unless they are wired to operate only with main beam. This is one of the reasons lots of cars now have foglights as part of the headlight cluster, thus becoming auxiliary driving lights, and being permissible any time dipped beam may be used. Also, if you know anyone using 100/80 headlight bulbs on public roads they're breaking the law.
The car you saw with 1964 number plates must display what we know as standard number plates, i.e. white front and yellow rear. The date on which the vehicle was first registered is the important date, constuction and use laws are quite clear about that.
Regarding the old Volvo system, which was the same as Saab's. The sidelights were fitted with 21/5 twin filament bulbs. 5w for parking lights and relay switched to 21w when the ignition was activated. The later dim-dip system which lasted until about 1990 was largely pointless. This was the system which lit the dipped beam bulbs at 1/5th brightness when the ignition was on. It meant that if you flashed your headlights a few times with the dim-dip lights on the relay blew.
The car you saw with 1964 number plates must display what we know as standard number plates, i.e. white front and yellow rear. The date on which the vehicle was first registered is the important date, constuction and use laws are quite clear about that.
Regarding the old Volvo system, which was the same as Saab's. The sidelights were fitted with 21/5 twin filament bulbs. 5w for parking lights and relay switched to 21w when the ignition was activated. The later dim-dip system which lasted until about 1990 was largely pointless. This was the system which lit the dipped beam bulbs at 1/5th brightness when the ignition was on. It meant that if you flashed your headlights a few times with the dim-dip lights on the relay blew.