Thanks for that link, although I have tried it before and there is no record of the deaths for the people I am interested in, namely William Baird born in Belfast in 1862 and still alive in 1918 in Belfast and his father, also William Baird born around 1835 in Ballykelly and still alive in Belfast in 1901 and 1911, although oddly not appearing on the 1911 census (his wife Margaret, whose death I also can't find, is, and listed as married, not widowed, for 50 years, so I assume he is still alive, just not at his usual address on census night). None of the listings on the civil registrar match the birth dates or place of death, which is most likely Belfast, for these people. It's all a bit strange!