I believe this is a Spanish made version. A friend has an XL Tactical spring version which I understand is now made back in Birmingham, and that's much nicer rifle. The trigger is the same unit, but feels much better. I wonder if the gas ram is overloading the sears on the GRT version causing the poor feel?
Given the bore and stroke (29mm dia x 75mm) and the cocking force required, I think this is a rifle designed for a much higher output that is then strangled down to UK power by the cheapest means possible, namely the tiny 2mm restriction in the transfer port.
I spoke to a very helpful guy in the technical department, and the rifle is now back in Birmingham, hopefully to have some issues resolved. I'll let you know how I get on!