Hello John, all the Parker Hale Lee Enfield's I have seen were #4s,(this is not to say they all were, just what I have seen) they removed the charger bridge and rear sight mounts,replaced the sights with barrel mounted models and restocked them, they also removed the bayonet lugs or rebarreled them, the magazine size was probably optional.
The Lee Speeds are all LEC or MLE actions although there may have been a few SMLE actions used in the final days of manufacture. While they're all Enfield's, mechanically they are very different.