How stupid of me! I failed to notice that I hadn't put the parish - a senior moment. They seem to be coming thick and fast these days. Yes, it was Knockando.
Re: Isabel being the 1801 Isabel Miller death in Elgin,
Robert Banks was the illegitimate son of a married Sunderland businessman. He was baptised in Elgin and Isabel's brother Charles Miller, a resident of Sunderland, was the sponsor. Isabel and two others were the witnesses. As Isabel's father was alive at the time and resident in Knockando, the only reason I can see for the Elgin baptism is that someone related to the mother was resident in Elgin. Charles was not so I am tentatively assuming it was Isabel. Robert renewed the stone on Isabel and Charles' parents' grave and there is also listed on that stone a daughter Margaret Miller who died the year of Robert's birth. The 1801 death in Elgin reads:
March 14th 1801, Elgin. Died here, (Margaret crossed out) Isabel Miller residenter in Elgin and was buried in the Cathedral Churchyard.
I am wondering if it was Robert who arranged the burial and, when asked his mother's name, said Margaret before it was realised that the dead woman was his aunt and not his mother. I know this is all speculation and one of the reasons I am trying to find out all I can about Thomas. I am looking for any further information that may provide clues as to where Isabel died and who was Robert Banks' mother. Robert died in 1864 in Newcastle.