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So I think it's safe to say it is definitely a British made bicycle.
The fact that you think the fork crown is Nickel plated helps with the date range for when it was manufactured.
Chrome plating replaced Nickel plating on brightwork parts around 1928/29, but some companies still offered Nickel plated parts in the 1930's as they used up pre-existing stocks of components.
'Sturmey Archer Gears Ltd' replaced 'Sturmey Archer Gear Co.' as the companies official name sometime around 1934; possibly a year or so earlier?
So, using these two facts, I think you could safely say that it's (probably) a mid1930's bicycle (if one assumes that is the original rear wheel).
Keep looking for markings on the bottom bracket if you can.
I think this is a Raleigh from the 1930s. I also suspect the front end has been replaced. It looks to me like the fork and handlebars do not match the bike and the front brake has been moved to the rear. Here are a few photos from a 1930s Raleigh that show the seatstays bolted on and a brake mounted under the chainstays in the same manner as your bike. That, along with the pedals, and the rim on the rear wheel are the clues I am using.