Nice No4. Yours looks to be a 1950 Fazakerly in very nice shape.
I have a "blonde" 1954 Fazakerly No4MK2 that looks like it was unissued before it was sent out into circulation. It shoots really well and I also have the bayonet.
I also have a 1946 BSA No5MK1 with all matching parts. It too handles very well. I've taken a doe with it, as it's a great brush rifle.
Aqualung