Well gentlemen - I have another update. After visiting Amazon's website and placing an order for a "Speedy stitcher", I enlisted my wife;s help and between us, in just over an hour we (me working on the inside and her on the outside of the car) we were able to save ourselves the £270 + VAT by re stitching the lower half of the window to the fabric. The thread that it came with seems thicker and more durable than was on there originally and I expect that it'll give us around another six months out of this hood. Unfortunately on our hood the zip seemed to be stuck, otherwise the job could quite easily have been carried out by one of us in around 90 mins I'd say.