Wayne - sorry for the late reply. Just got to my PM's and saw your question. I bought the hybrid tuner from Ebay Germany. From memory it cost around £420. It's good but not really £420's worth if you know what I mean. Now your folding rear seats on the other hand......! Where did you but those to retrofit?
Hi Gavin, my car came with the through load option from the factory, what i added was the electric rear blind and the side blinds in the rear doors.
Adding the through load seems fairly straight forward, difficulty would be sourcing all the correct parts.