It's not the council that's chasing me now but Newlyn. When I made the £50 offer I did ask what is the minimum they would accept and they mentioned the above. I would need to pay half the debt up front and the other at the end of the month, which is something I just cannot afford right now.
Sorry if I forgot to mention that this is for 2 tickets, not just 1. So 2 separate debts of around £160. Which they put into a total debt.