I've had a fair lot of '53 /'56 Enfield's over the years, but never got particularly involved with Sniders (they were still on FAC when I was in my collecting prime
), so, I've probably been under the impression that all of the made-as-a-breechloader's were fitted with the safety catch, my mistake.
One other thing, do any of your Sniders have the chained firing pin protector? I assume that it's a bit different to the old nipple protectors, I've looked at some photo's and it seems that they have a leather part incorporated. I do have a nice Volunteer Snider that's missing the protector and hope to make one when I get something to work from.