Your bike is a bit of a puzzle. Triumphs were made in Coventry until Raleigh absorbed them in 1954. As your headbadge says "Nottingham" I think it's safe to say it's post '54.
Looking at Kurt's Headbadge site, it looks like an early '50s bike:
Raleigh Serial Numbers & Charts
The decals look late '50s to me.
But your hub is a '64. I'm inclined to think the rear wheel is a later replacement.
Yes I'm thinking late fifties and I've got a theory on the hub, My theory is that when it was new it had an unreliable SW hub which was replaced in 1964 with an AW hub
Its a nice theory so I'm going with it lol