Thanks - so as with quite a lot of things in life what I thought was a simple thing turned out to be more complex to sort out. In the end I have got upgraded springs and they do make a difference. The hybrid version is trickier to get springs and spacers to fit, as space is more limited it seems..Also the initial springs I was sent were 20 mm too short. After re-measuring JDM have sourced and sent springs that are the correct length. I would recommend these. From the project I do have some springs and spacers that are now surplus to requirements if anyone is interested.