Hi Hookleg,
Thanks for the research. The mill betwixt Alboro' and Thorpness was a windpump called Thorpe Marsh or Black Mill.
I noticed a mill on the north bank of the Alde (upstream from Slaughden) on the OS 6”, 1881-83 map. Its marked as "OLd Windmill", and is ideally placed for a windpump, being to the side of a sliuce and on the river bank. I can find nothing to give her a name though.
I think the search goes on ...
Windy
PS Fincham's was, I think, a wealthy gent and his name pops up in and about Aldeburgh, but I'll look into any connection to the cottages