That's correct Brian, going from memory think its the Birmingham proof, the London proof is just one curved sword (Scimitar I think)
You are thinking of the "Seax" (ancient Anglo Saxon term for the sword, and from where the name 'Saxon' comes from)
The proof mark is actually an 'armoured arm holding a Seax', and yes - it is one of the London Proof House markings.
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...