Good ideas everyone, like the one about propping rear of bonnet a bit, I have seen the side vents but it scares the s**t out of me to cut my nice titanium bonnet!!
Were the vents easy to fit Alan?
I think the fan does come on by itself Alan but I've never had the car that hot on the driveway to check, maybe after next run out will leave it running when i get home and check, I just flick fan switch when sat in traffic for any length of time