Yes, this is very progressive…

ENGLAND – Alex Nash, from Cornwall, was invited to the party just before Christmas.
An invoice for £15.95 was sent by his schoolfriend’s mother Julie Lawrence, who said Alex’s non-attendance left her out of pocket and his parents had her details to tell her he was not going.
Alex’s father Derek said he had been told he would be taken to the small claims court for refusing to pay.
‘Understand she’s upset’ – Alex’s parents, from Torpoint, had accepted an invitation to the party at a dry ski slope in Plymouth, Devon, just before Christmas.
However, they realised their son was double-booked and due to spend time with his grandparents, which he did.  His parents said they had no contact information for Ms Lawrence at that time.

They found the invoice in a brown envelope in his schoolbag last week.  (read more)