Hutch
I have had an extensive email and photo exchange with a friend this afternoon, and he used some strong words which out of respect to him I shan't repeat!
The friend happens to be Captain Peter Laidler, REME (Rtd), ex of the SASC Warminster.
What Peter doesn't know about late Enfields isn't worth knowing, and he was one of the major technical contributors to Steve Raw's authoritative book on the SA80 and derivatives, "The Last Enfield - SA80 - The Reluctant Rifle".
Peter confirms the rifles that went to Canada were modified the same as mine. He has spoken to another owner whose L98 is seven serial numbers away from mine, and his is modified the same as mine. He was also involved in sending one to NZ some while back (also seven serial numbers from mine, in the opposite direction), and that was also modified the same way.
The definitive answer to this is on page 213 of Steve Raw's book, in a picture of the Enfield Competition Rifle, basically an LSW with the gas block blanked off, single shot, fitted with a modified Cadet cocking assembly. You can see clearly from the photo that this rifle is also modified exactly the same as mine and the other two mentioned above.......and Peter confirms this rifle was obtained new, directly from the ROF Enfield factory modified in this way, which concretes the provenance of these modifications.
Peter confirms not only is mine authentic, but is a very early and original rifle.
As for being a cut and shut reactivated deact? Can't print Peter's comments on that either

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There were a number of rifles originally sold into the UK (I suspect yours is 1986 or 1987, and they were perfectly legal to be sold at that time as they were pre Hungerford (1987) and pre Firearms Amendment Act 1988, which is of course what followed the Hungerford massacre and banned semi auto rifles in the UK). Whilst the L98 was and is always Section 1 and always UK legal, the immense political uproar after Hungerford not only killed off sales of semi auto SA80's in the UK (Pat Walker famously being one trade seller) by way of the '88 Act, but the UK market for the S1 legal L98 was effectively killed off politically too as it looked for all intents and purposes the same as the banned SA80 semi auto, and it was made by a government owned factory, which is why ROF Enfield looked to Canada for commercial sales.
Just because yours doesn't look like mine, that doesn't make mine unoriginal. It was just produced that way for a different market because that is how Canadian firearms law at the time dictated it.