Out of interest I searched the web to see if anyone else had come up with any innovations for keeping themselves dry.
I finally came across this site "DryBike" based in the Netherlands. By using a language translator I was able to find out how it worked being attached to the bike.
I then, still using the translator, emailed the company to see if they would ship to the UK. I am hoping for a reply back soon.
The cost of the umbrella adaption would be £13:76 excluding any postage and packaging. A bargain me thinks, and pretty neat.