Winkworth Arboretum and West Green House and Gardens are National Trust properties and if you are not a member you can pay an entrance fee. The Savill Garden is part of the Crown Estate and has an entrance fee for non members, payable at the entrance.
I really hope you enjoy my wanders and will come back again. I featured West Green House and Gardens in a blog a few years ago which was taken up by West Green’s owner and added to their website. The history of the house and gardens is really interesting. Since then The National Trust has taken over the garden.