This week I decided to do something about it. I watched some videos on YouTube about composting and building a compost bin and set about building a bin and filling it with some of the heap layering it as best I could. After about 10 hours of digging I have now redistributed the rotting leaf mould and grass cuttings and the whole corner looks much better.
I also added a closed composting bin for food scraps - hopefully it wont attract rats.
In building the compost bins and restructuring the garden waste heap I feel I have achieved something useful to help the garden ecosystem and I look forwards to seeing the benefits of my work in future. The benefit to me is that I now have a tidier garden which appeals to my aesthetic sense when I look at it. Another benefit is as the compost develops I will have a useful resource for the garden.