Your comment on the pop-out indicators has made me do a bit of research.
It seems that Vauxhall made two types of Velox models or rather three types - all called the type E or model E. First was the EIP, introduced in 1951 with a 6 cylinder 58hp engine, then in 1952 came the EIPV (yours) with the same 6 cyl engine but upgraded to produce 64hp. Later in 1955 came the facelift model pictured below:
The reason for narrating this story is that the pre-facelift cars (as your EIPV) had, as you said, pop-out indicators or trafficators or semaphores as they are called. If you see the 1955 car above, you will see that there is no slot on the 'B' pillar indicating that this car had flasher type indicators. Here is an extract from the Guardian dated 17 May, 1956.
New rules for car indicators: from the archive, 17 May 1956 | From the Guardian | theguardian.com
That brings me to an interesting observation regarding your car. I believe it to be an early 1955 or late 1954 model. Certainly not a 1956. however I am always ready to be proven wrong. As far as getting the semaphores working by making new ones from scratch is a tall order. I will be very surprised if your denter gets them right. There is also a light inside them and there is a amber coloured plastic cover over the light too. If I were you, I'd go for just converting the car to flasher type indicators.
Regarding the fan in your car, it is not original and was changed to a plastic one at some stage in the car's life as was the alternator instead of the original dynamo. Alternators were seen in cars somewhere in the 60's. Having both the plastic fan and alternator are not necessarily bad things. The present fan is certainly more efficient than the original steel one. Only down side will be its noise. If the fan is not physically touching the radiator, then being close to the radiator will further improve its ability to move air through the radiator coils.
Still waiting for more pics of the jobs done so far.
