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They're SMLE's regardless of whether they are No1 or No4.
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No. They are Lee-Enfields, but not SMLEs. The No. 4 is not an SMLE for two distinct reasons.
Firstly, SMLE stands for Short, Magazine Lee-Enfield. It is the shortened version of the Magazine Lee-Enfield or MLE; while most were produced new large numbers of MLEs and earlier Magazine Lee-Metfords (MLM) were converted into SMLEs in two programs that produced the SMLE Mk. II ConD (an MLM or MLE converted to an SMLE Mk. I) and the SMLE Mk. IV ConD (an MLM or MLE converted to an SMLE Mk. III). ConD in this case is shorthand for ConverteD. It is not possible, no matter how hard one tries, to convert an MLM or MLE into a No. 4. They are too different. The No. 4 is an entirely new rifle that shares almost nothing with the SMLE/No. 1. The few things that will interchange require modification.
This picture contains an MLE (1897 Sparkbrook MLE Mk. I) and an SMLE Mk. IV ConD (1909 Enfield conversion from a 1901 Sparkbrook MLE Mk. I*).
Secondly, the term "SMLE" was obsolete and no longer in use by the time Rifle, No. 4 was adopted; the rifles that had been called SMLE in nomenclature were now being referred to as Rifle, No. 1. The nomenclature was changed on 31 May 1926.
So, the Rifle, No. 4 is certainly a Lee-Enfield, but cannot be called an SMLE. That term refers to Rifle No. 1 (and No. 2) and earlier obsolete marks that weren't given the Rifle, No. 1 nomenclature (mostly Mk. Is and the ConD rifles).