Simonsaorosa's link is good, I have previously used it in research

My belief as that the commercial versions built by BSA using Lee's and Speed's patents had to state so they were referred to as Lee Speeds

All (I believe) were on a Long Lee Enfield Action (internally different from SMLEs), mostly with the longer barrel

All major makers bought these in from BSA with slight variations (My own Westley Richards has a full length broad rib and later safety)

Later Sporterised SMLEs whilst equally attractive and effectve are not strictly speaking Lee Speeds

TH44