Since 2015 I have been getting us new Zealand heritage family membership. I opted for this because it gets us into both English heritage AND national trust sites for a fraction of the price. The annual family membership works out at around £50 per year.
We have had fantastic days out exploring Stonehenge, Dover castle, Hughenden manor, Carlisle castle and the battle of bannockburn experience to name just a few.
We find that visits out places really help with learning. Because home education isn’t about being at home all the time.