Whilst I probably agree with you Chris, there is another possibility!
Over the last two or three years, the eastern tips from Moulds level, seem to being worked for gravel. indeed as I passed today I noted one or two apparently new machines on the site.
It could be the land owner has leased off these tips or even sold them, and depending on the size of the area this could possibly include Moulds entrance, and these lessees might be responsible.