The Lee Enfield is a Controlled Round Feed rifle.
The Lee Enfield Rifles (SMLE and other later versions for example the NO4 Mk1 and 2) are all Controlled Round Feed.
The Lee Enfield bolt controls the round as soon as it comes out of the magazine. This prevents double feeding etc.
Controlled Round Feed does not require a long non-rotating extractor, however that's the feature of the best known ones like the Mauser and its derivatives.
Many books have been written on the Lee-Enfield. Good luck.
Entire books have been written on Lee Enfield Rifles. You'll have to narrow it down a little. A Wikipedia search for SMLE will help you get started.
See the link below to a good Wikipedia article on the Lee Enfield. There are several DIFFERENT .303 Enfield rifles.
1917 lee enfield
SMLE- aka the Lee Enfield
The 'E.Y'. rifle was named after Sir Ernest Youlle who invented it, or more accurately, adapted it from the standard Lee-Enfield rifle
See the link below for a short treatise (with photos) on the various Lee Enfield oilers.
ww1 Britain standard issue was a Lee Enfield and German was a Gewehr 98 WW2 Britain standard issue was a new version of the Lee Enfield and German was a Karabiner 98K
"Enfield" refers to the Royal Small Arms Factory in Enfield, United Kingdom, and the name "Enfield" is applied to small arms manufactured or designed by the Royal Small Arms Factory (even if they didn't come specifically from the Enfield factory). There are several models of pistols and rifles which bear the name "Enfield", the most famous of which is the Short Magazine Lee Enfield rifle.