Well, today I realised why my polar alignment was always out, I couldn't track anything for more than 30 seconds without getting some form of star trails.
Turned out that the factory alignment of the polar scope with the rotation axis of the mount was out.
So I spent a good half hour with the polarscope centred on the chimney pots of a house about half a mile away and a tiny allen key. Basically the task involved centreing the polarscope then rotating the mount 180 degrees around the R.A. axis. It's when you rotate it that you see the error, if the polarscope was correctly aligned then the centre reticule would stay on target as the mount rotates. Once you see the error you have 3 adjusting screws to set the reticule to what it should be.
In my case it was way out, bit of a fiddly job but the manual supplied by RV Optics had a whole page on how to do this.
Can't wait now to get some longer exposure photos!
The next challenge will be to set up the setting circles so that I can have a manual goto mount!
Just found this site, looks promising......