Simon Harris will stress that the timeline for making the reforms to the Legacy Commission would not result in a timely outcome for Mr Brown’s widow.

Judges in Belfast have ruled that NI Secretary Hilary Benn is acting unlawfully in failing to hold a public inquiry into Mr Brown’s murder.

Northern Ireland’s First Minister said the family of the GAA official had ‘waited far too long for truth, justice and accountability’.

The GAA official was murdered in 1997 by loyalists.