What type of thread is it? UNC or Metric Coarse are the most common in the UK; there are also Metric Fine, UNF, Whitworth, BSF, CEI and pipe and cycle threads (to name but a few). Even if the die is a bit blunt, as long as there's no chips out of it or teeth missing it may come in handy at some time for cleaning up a bolt or stud. It's not exactly expensive!