Thanks for that Frances. Catherine was married after the 1891 census and died before the 1901, so I have no clue where she lived/died unless I send for the death certificate, which I'm reluctant to do at this stage.

At the 1901 census William McMullen, who I think is her brother, is living in Shaw's Brow (with what seem to be 2 of her surviving children) which I think is pretty close to St George's? There seems to be no trace of her husband Nicholas on the Island, dead or alive!

Thanks again for your help.