Glad you are getting to grips with it Steve. Yours is the 1Z Skoda unit that everyone else has, these offer good compatibility with the RNS510.
I've just done a brand new Pirelli this evening(it was collected from the dealers this afternoon and the owner let me loose on it), very nice looking car - First I've seen.
I'm out of stock on these at the moment but I have some more coming around the end of this week early next.
It does work out to a little over £300 as you'll need to add a few ££ for the connectors which you can buy from a VW dealer.
Obviously I've done a fair few now so I'm always looking for ways to perfect the installation. Removing the clocks is just a little easier to get the wiring in. I also only make two connections behind the radio now for the CAN. Power is taken directly from the fuse panel.