I asked what Meeting House the Jeffcoats would have attended. I have since found that the Upperside Monthly Meeting, where Daniel Jeffcoat's birth was registered, covered 12 Particular (weekly) Meetings: Amersham, Aylesbury, Burnham, Chalfont, (= Jordans), Chesham, Chorleywood (Herts), Farnham Royal (----- Tiler's), Meadle, Missenden, Owlswick, Rickmansworth (Herts), Watford-with-Flaunden (Herts), Weston Turville, Wingrave, Wooburn and Wycombe. The Jeffcoats are most likely to have attended the Aylesbury meeting.
A colourful history of Ackworth School can be found at: Henry Thompson, A history of Ackworth School during its first hundred years”. The Centenary Committee, Ackworth School. 1879.
https://archive.org/stream/cu3192403...17512_djvu.txt
A list of pupils and the dates they attended is at: List of the boys and girls admitted to Ackworth School during the 100 years from 18th of 10th month 1779. The Centenary Committee, Ackworth School. 1879.
https://books.google.co.zw/books?id=...page&q&f=false