Data marked up as format ixt:numdash outputs as - still, this is incorrect.
i.e.
<ix:nonFraction name="uk-gaap-pt:NetProceedsFromIssueDebenturesLoansNotesBondsOtherLongTermInstruments" contextRef="General_ClBal_LY" decimals="0" scale="0" unitRef="GBP" format="ixt:numdash">-</ix:nonFraction>
currently outputs as
<uk-gaap-pt:NetProceedsFromIssueDebenturesLoansNotesBondsOtherLongTermInstruments contextRef="General_ClBal_LY" decimals="0" unitRef="GBP">-</uk-gaap-pt:NetProceedsFromIssueDebenturesLoansNotesBondsOtherLongTermInstruments>
not
<uk-gaap-pt:NetProceedsFromIssueDebenturesLoansNotesBondsOtherLongTermInstruments contextRef="General_ClBal_LY" decimals="0" unitRef="GBP">0</uk-gaap-pt:NetProceedsFromIssueDebenturesLoansNotesBondsOtherLongTermInstruments>
I have attached what I believe is a solution to this issue.
Solution