Yes, that entry in Lennon Wylie Directory states Colonel Gilmore was nobility and gentry but apparently this just means it was a well off family and so not in Burke's Peerage.
I cannot afford to pay 19 pounds an hr for research and PRONI charges 48 pounds an hr. I am afraid converting the Australian dollar makes those charges even more horrendous. Death Registrations were after 1863 in Ireland weren't they? It is a shame I can't get back further by finding his parents names. He had such a fascinating career starting with The Royal Inniskilling Fusiliers, 1805 West Indies Regiment, received medals for fighting in wars in all the Peninsular Wars and then finally was one of six colonels that 1817/18 took regiments to fight in Venezuela against the Spanish. It has proved to be such interesting research with him mentioned in many books. He spent his last 28 years as Barrack Master in various towns in UK and Scotland before retiring to Boghead. I presume he came from there because a John Gilmore lived there prior to him.