There's an old Knights' Templar property about 2 or 3 minutes from me. They do a very good event and it's free to get in when no events are on if you just fancy a picnic or a wander round the herb garden. The timber framed barns are feckin huge inside, and they still have the original builder's bills, one is 800 years old this year. Have a look at the pictures at the bottom of the linked site, shame there are no people in the pictures for scale, makes the buildings look smaller than they are.
https://www.explore-essex.com/places-to-go/find-whats-near-me/cressing-temple-barns