Well I got the thing sorted. Basically the instructions are written incorrectly!
It stated that out of the 4 dip switches then no1 should be 'off' for golf and 'on' for Polo. It's the other way around!
Also it states to set switch 2 to off if you don't have a reversing camera and on if you do. If you have park assist then this needs to be on otherwise when reverse is engauged there's no screen showing the pdc range.
Anyway all sorted and tbh its a really great bit of kit, works perfectly well, has lots of options and looks better than the £1700 vw option.
The dealer tried to sell it at 599.00 but I sourced a new one for 425.00 and fitted it myself!
Thanks for the replies