I'll try to find out more about Ashmead House and the other places you mention on my next visit to the Gloucestershire Record Office.Probably early next year - unlikely to be before Christmas.(I'm on the West Coast of Wales, and very busy at work at the moment).
The only one I have a snippet of information about is the Ashmead Mill:
I have a copy of a paper 'The Silk Industry in the Chalford Valley' by Hugh Conway-Jones (no date). This is about the growth of the silk industry in the former woollen cloth mills during the mid-1800s. Apparently the woollen cloth industry was concentrating in a few of the larger mills and the smaller ones turned to silk instead. There are 13 mills along the valley, with Ashmeads Mill towards the East end.There is a passing reference to Ashmeads Mill becomimg a silk mill during the 1870s, but nothing about its earlier history for the time period you're interested in.In the References, however, there is a note: 'Deeds of Ashmeads Mill in the possession of Mr. R. Clarke of Chalford'.
This paper came from another Ashmead researcher whose family were in Bristol in the 19th century but seem to link back to Bisley (and then back to Somerford Keynes on the Wiltshire border).We haven't yet managed to connect my Elizabeth in Bisley in 1667 with his James who was baptised in Bisley in 1728(son of Christopher), but we suspect there is a link. If your notes can shed any light on this we'd be very grateful!