I haven't worked since my contract expired at the end of June (very much the Michael Owen of library work) and since then I've received two payslips.

One was overtime pay that we always got paid a month in arrears, fine.
The other has no payments on it other than -£135 Tax ie I've been paid £135. I'm not aware of any back pay I'm owed and this isn't how I've received rebates in the past.

Whasssssssup DiS accountants?