I lent my Vogue to my partner today while her Disco 4 was in for service at a local garage. What they found was a surprise! Change the air filter and they found the filter box was completely blocked with a birds' nest, complete with eggs! We'd seen some little birds coming and going through the side grill earlier this year but thought nothing of it! She says the car runs a bit better now with the new filter.
I suspect that my Vogue needs a new thermostat, it's very slow to warm up in this weather and dies eventually reach normal temperature, but I also noticed that when sitting in traffic the temperature drops below normal. It's going in to have the oil cooler changed in January, is it worth changing the stat as well?