Very interesting Foggy, thanks for posting - and how lucky to have such important paperwork.
I often stop off to see one of Harrison's early wooden clocks at Nostell Priory, (National Trust, near Wakefield), which has now been removed from its wooden case so that the internal workings can be viewed
More info here if anyone is interested
https://bhi.co.uk/wp-content/uploads...-the-Month.pdf