A new one on me....

Went to book a CL in Sussex as we had to visit a sick relative, just one night needed. Told by the owners " Yes we can fit you in but you cannot empty your cassette as you are only staying one night, too many people have emptied full cassettes after staying one night so we have to empty the sceptic tank more often"  This was a C&MH CL.

Never heard that before.

Well, if you showed them that your cassette was empty on arrival, then surely you should be allowed to dispose of anything you produce whilst on site.  

Especially so if there are no toilet facilities.