Genuine Jielde lamp?  

.
Looks good to me.

the real deal.
how much did you pay, andy?

all in, £63
google isnt...
all in, £63
google isnt my friend today, cant find any reference to this London company and Jielde

.
The London comapany may have just purchased them for there workshops.

I'm sure
your lamp is right and they just made a special plaque for that specific company's order.
If you want two switch out the plaque, you can buy them on French ebay, here:
http://shop.ebay.fr/i.html?_nkw=etiquette+jielde

I think aurthur is right,...
I think aurthur is right, this most likely would have been the case in the Uk. As all Jielde lamps are manufactured in Lyon, France, as far as I am aware, and still are until this day. I would imagne the workshop would have been an expensive set-up in its day, as there were plenty of work lamp alternatives around at this time, the most commonly recognised being herbert and terry in Redditch Birmingham with the Anglepoise. But of course lacking the internal sophistication of the jielde, being able to operate 360.
Oh and did I mention nice lamp 🙂

The label says
supplied BY, not TO..
My understanding is that the company was a supplier in the UK of Jielde lamps