Looked up 3 places to visit this week online and as they would have cost over £80 for the two of us we decided to buy an annual membership. Have since found out all 3 places are free to visit on the days we plan to go as part of heritage open days which is NOT clearly advertised on their website - if I’d known this we wouldn’t have bought a membership and as there are very few NT places near us it’s a lot of money wasted in a cost of living crisis. We save hard for all holidays and cannot get a refund as it’s a charitable donation which is ridiculous when you visit the sites you are charged a set entrance fee and are not asked for a donation.