Gec Z9454s normally run on 90 or 66w SOX, and they have a triangular-shaped bowl. I also believe that they have a aluminium canopy.

near brooklands museum, Weybridge 

There are a few GEC Z9454s near brooklands museum. They are on steel columns and probably run on 90 or 66w SOX.

This poor GEC Z9454 has had its bowl smashed off, and even the 90/ 66w SOX lamp is smashed. Fortunately, this is the only one like this, and most of the other ones are in good condition.