Provenance help

I have a 1918 BSA no1 MkIII*, Canadian C-broad-arrow marked. There is a "T" on top of the barrel where it meets the receiver and the trigger is attached to the trigger guard, not the receiver like my others. Is there any significance to the "T" and different trigger layout?

Also it has some pitting, the furniture is now fire wood as well. How can I fill the pits and begin resto? I have looked ar Dura-fil, heard of people using JB Weld and tig or mig. I want to have it parked by if I use dura-fil may have to use aluma-hyde, etc.

No1 rifle.......... trigger........ trigger guard.......... body........... I'd go back and check. It SHOULD hinge about the trigger guard!

Don't bother about the pit marks or fill it with anything because it will ALWAYS show - eventually. They are all part of its history. Just get it refinished as it would have been in the Military. Nothing more - nothing less. Do you remember the old days when the 'restorers' used to fill in the rusty car chassis with old chicken wire and newspaper (so you could see the date when it was originally restored.....) then slosh a 1" coat of pudding over the top, followed by a cat-lick of paint? Well don't do the same with your grand old lady. She's too dignified for that

I will just clean it up then blue or have it parkerized and get new furniture.
The bolt is also new (or newer), so its not all original.

As for triggers, my '43 Ishy attaches to the receiver, wondering if one or the other is an anomaly.

a 1943 ishapore with trigger hung from the receiver is the anomaly there.

I should get some pics of it then. It is marked No1 MkIII*. I wonder how/why it is like that.