Thanks. Yes, have a cooler thermostat sitting here, I just have to install it. It is amazing the difference in under bonnet temp between the old Rangie and the Disco. Both are running 4.6l motors on gas but the Disco is soooo much hotter.
I don't mind the engine/water temp running at 95-100 deg as this is not a bad thing and as long as it stays below 105 then it is not a problem and probably better than running too cold. However the high underbonnet temp does worry me. As you say, it is hot enough to cause problems with other components.
I actually wondered if anyone has tried installing vents or grills in the bonnet, I am thinking it might make a bit of difference.

