Hi,
I have been talking to this company I found via ebay called BBA Reman. I managed to get a whole refurbed unit for £85 plus £10 carriage.
They seem very helpful and send you out the unit via courior and all they ask is for you to fit the unit and pack up your old unit and call them, they will then send out the courior to you to pickup the old busted one and you get no charge for that!
They seem very helpfull too and very polite people. So far (unless things go bad) they seem like a very good company to deal with.
Their web address is
http://www.bba-reman.com
But to get it cheaper I woul search ebay. They had my dizzy on the shelf and said it would be with me the next day
Dave