Landrover Series 3 Windscreen

Hi all, I'm new to this site, but have read your forum for a number of years to my advantage and now need expert help to the following.
I have been building a landrover Hybrid, Discovery 1 TDI300 chassis (shortened to 87 inch) with a series 3 bodyshell, (88 inch) over the last two years and at the end when I came to register it with DVLA, was told that it had to go through a IVA test, (I now know that I shouldn't have told DVLA anything, but too bleeeedin late now) so very expensive/very intensive test and the Landrover FAILED, most of the things were just silly easy things to sort, a couple were not. The main one giving me grief is the windscreen, seems that the previous owner may have changed the screen/surround, and it hasn't a "Kite mark" and I can't find one to fit with the correct kite mark. (E2 blah blah blah) Please can anyone tell me if they've seen a landy with this type of screen? what screen does it belong to? and where I can purchase one with the correct mark?
See attached Photo
Thanks

Looks like Landy lightweight converted to single piece screen to me

Looks like a standard series surround with the centre divider removed and a piece of flat glass cut to fit.
I can't advise any further except to see if a windscreen manufacturer can knock you one up or fit the correct surround with the correct glass.

as above but might be easier just to get a std series frame and screens