Firefly Spark plugs and gaps...can you help?

I am trying to get my 1934 Firefly tourer running perfectly and I know my plugs and gaps may be wrong as I have never been advised as to what is correct. Does anyone know what they should be please. Thanks!

Good morning.
I am told that the Green Spark Plug Company are very helpful and extremely knowledgable. They have a web site with contact details.
Good luck.