Thanks Chris. I thought of that as well but it's a bit pricey for my budget at the moment. I was hoping for a sub £100 lens.
Also, 14mm or 20mm wouldn't make a lot of difference so I changed to 25mm, 28m or 35mm lens.
I heard a lot about Nikon 28mm F2 but seem to be out on ebay. I also have a Michael Lens 35mm f1.7 (ebay: which is the same as CCTV or SLR Magic 35mm Lens) not sure about the quality to use it for a documentary.
Back to square one or use my panny 14-140mm.