Oop's forgot to post sorry, got company staying at the mo so will be brief.
The design I first had in mind would cost ?90 a pair to manufacture, so out of the question.
I have just come up with a brilliant design that should be a lot cheaper, but once again I have to draw it out and take it to the engineers.
If you can bear with me I am still working on it and it should be worth the wait. :beer: