Kaiser, yes Homebrewed, it was about £38 delivered and took 2 weeks.
chris667, you might be right. How much mileage do you think I can get out of it?
Thanks for the comments everyone.
I am really pleased with the bike although it is a bit spinny but I was expecting it and did not want to do it to the detriment of the bottom end.
It makes the transmission very smooth and fluid and it's so nice not to have to use a front mech!!!