The book Butleigh: a thousand years of a Somerset parish by The Reverend E.F. Synge (published by Butleigh PCC in 1974) devotes only two sentences to the Cedar Avenue:
"George (Neville-Grenville) was probably the planter of the cedar avenue. At any rate the Tithe map of 1830 does not show it, though the 1854 one does."
Today the Cedar Avenue is looking worse for wear. Some of the original trees have died and been removed. Many of the others are well past their prime and some are clearly dying. However a large number of replacement trees have been planted and protected with large tree guards. I presume these have been planted by the current owners of Butleigh Court.
Butleigh Court was built in 1845 by JC Buckler for Henry Neville-Grenville on the site of an earlier house. It became derelict in the mid-20th century but was restored in 1975 and converted into three dwellings. It was built in the Tudor Gothic style of the local blue lias stone dressed with Bath stone.
Western side of the Cedar Avenue