just thought I would add a note to this thread, I bought my unit in may from Dave and it is superb, I've been really impressed with how sturdy it is once fitted, both the screen and the camera. and also the clarity and distance that it's capable of.
I have used it on my .22lr, .17hmr and I now have a rail fitted to my .222 rem.
last Friday I did develop what I thought was an issue as when I got out in the field and turned on the unit only the ir worked, the screen did not come on at all.
initially I thought maybe the unit had been put away turned on and the batteries were flat, but when I put them in the charger they were fully charged.
I contacted Dave and we chatted about the possible issues and agreed that I should try a different brand of battery, which I have done this evening and it worked fine.
the batteries I bought initially were from torchy the battery boy, and as I said only the ir worked. the two batteries that power the screen would not work whatsoever, even when placed in the ir position.
I bought them from torchy as I had read that lots of people use them, but my experience of them in my night vision has left me very disappointed and out of pocket.
I spoke to Dave again earlier this evening to let him know the other batteries I tried were okay and that there is no fault with the unit and he gave me a link to the batteries he recommended, so I have ordered them instead.
many thanks to Dave for taking my calls and it's good to know that his after sales help is top drawer.