That Bren is my work. The bipod is a mk2 type, but otherwise the gun looks OK as a mk1(M). It is a bit harder to get a Bren with the proper mk1 butt, as these were replaced in service with mk2 butts.
The anti-aircraft butt handle is available as a repro from IMA in the USA for around $50. If it's an origional handle, then it's worth more in the $200+ range.
I have never had a problem selling a Bren in that condition (without the handle) for $850; in fact I usually have a waiting list of people wanting them. I would suggest that if the butt handle is an origional, you sell it seperately.
That Bren looks like one I sold to a fellow in your area about 2 years back who was a member on this board (brengunner or something like that).
The only thing that Bren really needs is the shoulder strap on the butt plate, and I have just managed to secure a bunch of those. You would also have to weld on the stud to the top of the buttplate.
That would also have been one of mine, and it was a #### and click. It sold that day, and I thought it was every bit as nice as the one in the photo, plus it had the proper mk1 extendable bipod.
