Louvred valver bonnet- row of ten at the RHS of picture are above the chargecooler and filter cone so should allow chargecooler rad heat to rise/be drawn straight out rather than warming up the inlet. The 9 at the front of the bonnet bulge are directly above and further back from the main radiator (right over the front of the inlet manifold) so should promote more air flow through the rad and out, rather than under the car or into the airbox area. Should do the biz at standstill where heatsoak from the main rad is a big problem. Well see once its on!
http://www.nickread.pwp.blueyonder.co.uk/images/forumhost/Image22.jpg
And seeing as Im having a sort out of the pictures off my phone, heres a couple from Donny South. Only the cream of the crop though!
http://www.nickread.pwp.blueyonder.co.uk/images/forumhost/Image23.jpg
http://www.nickread.pwp.blueyonder.co.uk/images/forumhost/Image31.jpg