Due to a minor cock up, our compost bins are on paving. We still get wormies in them and they rot down fine. Grass goo needs to be mixed with something carbony. Old newspapers will do (nothing with glossy paper tho'), or cardboard, or shreddings from hedge cutting and the like or leaves.
Ladies' wee is fine on the heap, but ladies lack the directional equipment so it becomes a palava with buckets to water the heap properly. I'd have thought if you have too much grass, you wouldn't need wee an accelorater
Geoff Hamilton was the best tv gardener ever, much better than the crew that came after, although Monty's a bit of a hunk.