Here's a pic in bright sunshine of one side done, the other not...

Parts used:
I bought these bulbs: http://www.amazon.co.uk/gp/product/B009 ... UTF8&psc=1 (£9)
and 2 of these resistors: http://www.rapidonline.com/Electronic-C ... or-62-8112 (£3)
and 4 of these Scothloks: http://www.rapidonline.com/Cables-Conne ... ue-51-0386 (£2)