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Apparently Igaro are bringing a light out imminently
https://www.igaro.com/c1

Win wings are great! I stick one on my Secan if it looks like rain - keeps everything off me (from the back wheel anyway). Also stops you getting covered in sealant if you have a tyre disaster

they're already out on wiggle for £15.29

I used Roger Musson's book to build my first wheels - a rear flip-flop one and normal front one. It was reasonably simple, especially since there was no dishing.
Also, if you don't want to pay and don't mind the older version, there are a few torrents of it around. Then again, the book's only £9

well decathlon has these http://www.decathlon.co.uk/EN/hop-steel-city-handlebars-3887954/ but they are steel and look really wide

I got a NOS sugino one from Alansbmx then polished the the colour off (only red, blue and gold available). It's a cheaper option at £6+£3.50 posted but depends on whether you have access to a polisher to remove the colour:
http://www.alansbmx.com/product_info.php?products_id=869

I just did this to an old bmx saddle - not as well as the above but cheaper than a new one!