Hi, I've just experienced the same issue with my 2007 Aero and that fact it wouldn't start on Monday morning this week whilst staying at a hotel in Sussex. I blew 4no 20A fuses in succession and a friend said that 20A seemed a bit small for the starter circuit and to try a 30A fuse. This worked perfectly and that car has been on the button ever since. I called Jamie at Brands Hatch Morgans and he said there was a printing error with the fuse box diagram with shows the fuse to be a 20A when it should be a 30A and therefore leave the 30A in at all times. Simple and much cheaper than a new starter motor which is what I was anticipating!

Cheers, Paul