So basically I tried it tdoay and as it is wet/raining I am having to just dig out huge chunks of mud with the grass on it (i.e maybe about 7cm at a time) (no big deal as I could DO with getting rid of a lot of mud)
At the moment I am just putting them into fairly waterproof plastic bags (i.e bin liners butstronger)
Now I could either chuck them in the skip when I get it or keep them til next year. I guess if the bags are kept sealed the grass will die and I will just end up with more plain mud again?