Ray, where are you going to get the short magazine Lee-Enfield? I was prepared at the age of eight to use one if we were invaded.
It would probably be close if the hubs and handlebars were black, as most bikes from that age were. Also paint the rims black.
I looked at Brown Bros catalogue, and oddly most of the rod brakes had the rear brake rod down the left side, whereas yours is on the right, as most bikes were.