In 1998 he moved to the Royal Ulster Constabulary and he was briefly Acting Chief Constable of the RUC's successor, the Police Service of Northern Ireland, prior to the appointment of Sir Hugh Orde in May 2002.
Gamble was among six candidates shortlisted to succeed Sir Hugh Orde as Police Service of Northern Ireland Chief Constable.
Hugh Masekela | Hugh Jackman | Hugh Grant | Hugh Laurie | Hugh Hefner | Hugh | Hugh O'Brian | Hugh Grosvenor, 2nd Duke of Westminster | Hugh Percy, 2nd Duke of Northumberland | Hugh Percy, 1st Duke of Northumberland | Hugh Martin | Hugh Dennis | Hugh Walpole | Hugh O'Neill, Earl of Tyrone | Hugh de Lacy | St Hugh's College, Oxford | Hugh Wheeler | Hugh Trenchard, 1st Viscount Trenchard | Hugh Trenchard | Hugh Pughe Lloyd | Hugh MacDiarmid | Hugh Lloyd | Hugh Greene | Hugh Carey | Orde Wingate | Hugh Wolff | Hugh Trevor-Roper | Hugh Shelton | Hugh Price Hughes | Hugh O'Neill |