Thanks all for your response! I thought too that the construction of building this pistol didn't seem to follow the same quality as some of the British makers would have done.
No Tang bolt, but screws, I don't what holds the trigger plate in place, I can't see any screws or bolts, I'm guessing it's held by a spur on the rear of the plate, the front will slightly move up and down if I push on it.
That was one example I noticed.