Are we seriously considering "small" and "local" a company with a 750 Millions pounds turnover and 30 Mil pounds profit?!?!? Come on guys!!
I also think the OP has absolutely nothing to worry about as it's written everywhere that if you don't pay the full balance the ticket will be cancelled. Whether that will be done or not by the TA is not the customer's problem, it is really as simple as that.