Leave you have taken but not accrued is paid for in cash by you. Third-hand information but someone who left last June had already taken six weeks leave in the first half of the 2014. One of the last things the company presented him with was a bill equivalent to three weeks salary to pay for the leave he had taken but not accrued. He had to scramble to put the cash together as he had already closed his accounts.
As I said, received third-hand so maybe someone could verify.