Thanks to those comments yesterday and welcome to my new followers. It was nice to read your ghost stories too!
I am rather proud of myself. I have floored my loft. I am always ready to give DIY a go, mainly because I am stingy at paying someone to do anything that I could possibly do myself.
Fortunately for me, laying a floor up in the loft was a much easier job than I anticipated, even though I am unfortunate enough to have joists that are all different widths apart (how annoying is that) which meant that I had to cut every single piece of flooring differently. Never mind.
Here is the final result though:
I have a good 10 metres squared of new floor space now which is going to be brilliant for storage. I even put in access hatches for where there were junction boxes (fortunately there weren't many of those).
One day I will do the other half (there is about 7m2 remaining on the other side of the hatch) but for now this will do nicely. All told, it cost less than £60 to do this and the lighting, not bad going and just 2 afternoons work.