[Image of Montacute from The Guardian https://www.theguardian.com/environment/2010/dec/14/country-diary-somerset]
and
Parishes: Montacute (A P Baggs, R J E Bush and Margaret Tomlinson), in A History of the County of Somerset: Volume 3, ed. R W Dunning (London, 1974), pp. 210-224.)
https://www.british-history.ac.uk/vch/som/vol3/pp210-224
The Montacute Archaeological Assessment report of the Somerset EUS (Extensive Urban Survey) (download pdf here) documents the history of Montacute in a brilliantly concise report commissioned by English Heritage and prepared by Somerset County Council in 1994-1998 by Clare Gathercole and Miranda Richardson, updated by Chris Webster in 2003.
It adds to the substantial Victoria County History (VCH) chapter on Montacute (A P Baggs, R J E Bush and Margaret Tomlinson, 'Parishes: Montacute', in A History of the County of Somerset: Volume 3, ed. R W Dunning (London, 1974), pp. 210-224.)
In Montacute snippets I've written my own notes on various aspects of Montacute's history