Actually my gt gt gt gf was Peter Haldane, but I don't know if he was the same Peter Haldane as the one you were referring to, even though I realise your one had a daughter named Agnes who was about the same age as my gt gt gm Agnes Haldane who married John Guillum Scott in Lambeth, Middlesex in April 1846. I have collected quite a lot of info about your Peter Haldane but nothing that decisively defines him as the same person as my one! I am happy to share what I have about your one, although I think you have most of it on giantlop already.