Andy,
You aren't kidding!
I went into the WKLB today and took hundreds of photos.
There is rat shit everywhere!
All chambers have droppings on the floor and I found 5 holes where they have tunneled through the dry stone walling.
I saw several kestrals scouring the barrow so they must have found a source of food, maybe they can help to keep the numbers down naturaly.
Amongst todays offerings was a bottle of alchopops, several sticks made into various shapes, flowers, moss and the usual tea lights.

The concrete cancer has really taken hold and the skylights are a mess.
With people walking on top the barrow there could be problems ahead!
It wasn't his bad last year and the only thing that has changed that I can see that would have caused the rats to invade is that David Hues has left a set aside area aound the barrow to encourage wildlife.
PeteG