We have a Parker Hale Model 1200 here, in .243win.
I think it's the second one we've owned. This one is the standard; nothing flash to look at, and a sporter barrel.
Action is a Mauser 98; very strong and reliable.
I'm pretty sure a Mauser 98 trigger (like a Timney etc) will fit the PH 1200, but the factory trigger is pretty good, if I recall.
It has 3 separate adjustments on it.
Mag is about 4-round internal, top load with hinged floorplate to drop the contents.
They have a devoted following in the UK, though the company has gone under; I think in the mid-1980's.
The Parker Hale name is now owned by (I think) a company who manufactures a range of gun cleaning products - no relationship to the rifle manfacturer.
Parker Hale made a number of rifles for the UK army, including quite a few models of sniper rifle.
Possibly also for Canada as well??
I think there is one UK dealer that still has some inventory of factory PH parts, but I dont know who it is.
We dont use our PH much these days. It seems to have some problems with feeding rounds out of the mag, but reading the other day, and I suspect we are missing a mag insert that kept the .243 rounds forward. It looks like the mag might be the same for a range of calibers, and .243 is one of the shorter ones.
They are pretty reliable, and that's a pretty strong action.
It should be pretty easy to re-barrel, and you should find that a lot of accessories and even some rifle stocks for a Mauser 98 sporter will fit the PH 1200.
It will be hard to track down an exact year of manufacture, as a lot of records were lost in some sort of accident(fire??) after the factory closed.
There is a bloke(ex PH employee) in a couple of the UK rifle forums who seems to be able to find out a fair amount about them, but you'll have to search and ask who it is.
Cameron Hatcher can also produce wooden stocks for a Parker Hale 1200, as he made one for ours about 3 years back.
I havent yet finished it, but it seems to be a pretty close fit as it was delivered.
http://hatchersriflestocks.com.au/Rebel Gun Works also often have parts for Parker Hale 1200's in their second hand stuff.
Good luck. If you can fit a new barrel to it, I think you'll find it will be a pretty decent rifle, and they have a decent pedigree for accuracy.