Judy, grandma, shop in a tree, white pony - what book??

[BerryPie]

The title says it all really. When I was little, I remember loving a book about a little girl (Judy, but I might be wrong) who lived at the bottom of a big (magic?) tree with her grandmother and a white pony (Sam?). It was a proper chapter book, but with lovely black and white illustrations. I think the grandmother ran some kind of magic pharmacy for animals in the tree, and there may have been an evil witch about, too.

Does anyone have any idea what this book might have been called, and who wrote it? I have Googled myself silly, but I can't seem to find it. I would be stupidly grateful as I really want to try to find it for my little girl. Thank you!

I know this book, I remember reading it, but I've had a google as well and got nowhere. I'm sure my mum still has it so if no-one else answers in the meantime I'll ask her tomorrow.

There's three of them and they are by Beverley Nichols (a man I think).

They were
The Tree that sat down
The Stream that Stood Still
The Mountain of Magic

I got them in a box set one Christmas :) My copy of the first one looked like this although I see it was abridged.

Sam was Bad and ran a rival shop with his grandfather.

I've still got my copy of 'The Stream that Stood Still' from when I was young.
I'd love to get the others for my DD.
I think they might be out of print now so maybe need to be prepared to pay a lot.

There's some on Amazon for not too much I think

Thank you!!! I really appreciate it and am off to amazon now!

Beaten to it! I'm really glad you asked though because I'd forgotten these books existed and now I'm going to have a re-read.

There is also a fourth book, The Wickedest Witch in the World, one of the latter books Nichols wrote.