Sorry am not in your area, but I get mine collected by local dairy farmer 2 or 3 times a year & he ends up muck spreading it on the fields he's resting.
I do keep it very tidy, tamped down & square
Costs me £40 - £50 a time (depending on heap size) so I budget around £100 per yr for it to go. H'es really good & comes within a few days to get rid, but he's happy to do it as the heap is in easy reach of the main gate and its hard standing all the way.
I also get my hay from him too (good price off the field)