In reply to higherclimbingwales: they are all over but lots from the seams. I emailed rab about it in the end and got this reply...
Sorry to hear you are having an issue with your new vest. If the item is very new you will get some down loss from the seams and any down caught in the stitching during manufacture works itself out. This should start to lessen during use. If after a couple of weeks of wear you still feel that the item is leaking excessively then you can return it to the shop you purchased it from as the item is so new.
Please let me know if you have any further questions.