Have you seen heather that looks like this? If so you have probably been looking at heather that has been damaged by a heather beetle attack. This can affect heather at different scales, from parts of plants to whole landscapes, and the foxy-red colour is the result of an attack by the beetle larvae this year. Heather that was damaged or killed in previous years looks grey and is often inter-mingled with this year's damage.
If you would like to know more about this pest of heather, look no further than the Trust's website.