found a mention of John in Slater's directory of 1870 in Clones town :
5 constabulary stations listed including one in the town at
Diamond street with William B. Kelly sub-inspector
and John Irvine head constable
.....
Looked at EVERY Irvine listed in Herlihy at TNA Kew but could not find him.
.....
just wonder if it might be worthwhile using the original RIC indexes on the films, rather than just the details in Herlihy's book in case there are any differences..
Shane