Could it have been a real No5 .22rf Trainer ?
Very few made.
https://www.rifleman.org.uk/Enfield_Rifle_No.5.html
A few years ago I saw one sold at auction that had the bolt jammed into the bolt-way (or the action was twisted) it made a "fortune" (cannot remember how much but it was 'many 100s' of GB pounds plus 25% buyers premium to add onto the hammer price)