I made an enquiry as to my options on 10th May. My dealer has just got back to me today to inform me that any spec amendment will result in the loss of current build slot, this means if I change the standard suspension back to s-line as I previously expected the vehicle will not arrive until late 2010 early 2011 instead of September! I thought with an unconfirmed build slot of week 26 I would still be able to make changes without penalty.