That doesn't really say anything.
Everybody in central EU talking about "Amnesia Haze CORE CUT YO" being a clone only blabla.
It's just a keeper haze from this or that seedline (I guess Amnesia Haze CORE CUT YO is probably something from Sensi) that was never worked into a seedline.
Once it was found, it was propagated as a clone. Does that make it a CLONE ONLY ELITE YO that nobody can find if they can't buy the CORE CUT CLONE YO?
In my opinion, no. Anybody could pop enough seeds of the same strain the amnesia was discovered in and, given enough seeds, will find the same or something very similar.
To your question:
What you give is very little information to go by.
Basically just the name.
Going by the name, I would say it was probably a God Bud keeper from JOTI (Jordan of the Islands).
The time frame and hype frame fits, as does the name.
Also JOTI was/is from/based in Canada if I am not mistaken so the whole "super rare, clone only elite YO" thing with UK also fits.
If my guess is right however, the bad news is that while you can still buy the God Bud from JOTI, his reputation has gone down considerably and "recent" grow journals of his gear do not speak favorably about it.
On the flipside, his God Bud was his most successful strain and was regarded as "good" for the longest out of his strains, meaning he probably preserved it the best/took the most care of it.
So if anything out of his stable is still good, it's probably the God Bud.
/Edit
Also would say it is unlikely that G13 in any form was "your G Bud". Why? Because of American Beauty. Big success box office hit, you know the flic, right?
Well it highly popularized G13 to the masses as connoisseur stuff and expensive/luxury bud.
If you tagged G13 to a potent strain, that immediately upped its price.
So I can't imagine anybody selling a G13 related strain, leaves the G13 out of the name. Doesn't fit if you ask me.