Cool, cheers lads. I ripped it all off and noticed the gaps, I'll go get some foam the day and have a look at making something up to fit to the bonnet.
edit - Wee update, went and got foam heating insulation from B&Q and fitted that round the back and sides on the bonnet. Modified the scoop surround by cutting it to size to fit the front of the top mount. Sits nice and tight now and the air should only flow into the cooler.