Right then chaps, like a number of other peeps on here I'm using a non standard gearbox in my 5 but wanted to retain the standard speedo, so after some measuring and tweaks of the design I came up with this.
The prototype I had laser cut but required some adjustment on the lathe, a bit of testing it works perfectly once I'd made a spacer to mount the standard sensor using a valver hub (although a different bracket could be fashioned for a GTT hub), the only thing you need is a valver outer CV joint.
Now it's all working I've had the CAD drawing adjusted and some rings made up for those that want them.