We were travelling on a Tuesday and on approach to the National Trust property it said closed, however... you can still drive up to the car park and do the walk and it's gorgeous!!
So worth a stop!
It's shut on a Tues/Wed if you want to visit the actual property and tearoom...but if you just want the walk go any time. When you get to the car park and get out, head along the little stony path towards the property - then through a very secure wooden kissing type gate (cows around!) Then follow the stony path around the walk - enjoy!!