Hi Emma, thanks for that information. I have used the Ordnance Survey maps before for other locations and find them invaluable. I don't know why I didn't on this occasion. Probably a senior moment. Next time I am passing through Greenlaw I will stop off and have a closer look. I was interested in the Bank as I had a third great aunt who was married to the manager of the bank around 1866 to 1871 if not longer. He was Allan Purves, born Greenlaw 1809 but he was in the 1881 Census in Edinburgh, presumably after retirement or the closure of the Bank as mentioned in your link. I have not established if he was there at it's closure. His wife, my 3rd great aunt was Sophia Wilson who was in Edinburgh living with her sister, another 3rd great aunt of mine, Margaret Wilson at the time of the 1861 and 1871 Censuses. Her husband was John Melrose, head of the famous Edinburgh Tea Importer.
Thanks again.