Does anyone know why it is closed from 20tn July to 8th August?

Filming!

The BBC’s latest costume drama of Hilary Mantel’s books “Wolf Hall” and “Bring up the bodies” which will mean some closures at Montacute House and Barrington Court.The filming also involves several other National Trust places – Lacock Abbey and Great Chalfield Manor in Wiltshire, Chastleton House in Oxfordshire and also Horton Court in South Gloucestershire,

http://www.ntsouthwest.co.uk/2014/05/montacute-house-to-be-closed-during-bbc-filming/

Thanks.