I'm trying to track down an Enid Blyton book I read as a child over 30
years ago. I'd like to know the title, and where I can purchase it.
Best as I can remember, the story involved 2 children, a boy and a
girl, who run away and find shelter in the hollow base of a great, big
tree. They make this their home, and bring food and supplies to it
from home. That's all I remember of the story.

Dear dscharf-ga,
 
From your description, the book you are seeking is ?Hollow Tree House?
by Enid Blyton.

I have found someone else who asked a similar question to yours and
this was posted as an answer:

"Hollow Tree House by Enid Blyton - I've found a copy of the Blyton
book suggested. Peter and Susan live with their bad- tempered scolding
aunt and shiftless uncle. With their friend Angela and her puppy
Barker they find a huge hollow tree in the woods and bring old rugs
and castoff furniture to make it into a secret house. They find their
way back and forth by a string marking the trail. When Aunt Margaret
decides to send them to a Children's Home they run away to the hollow
tree. They live in it for a few days, washing in a pond and making a
bed from heather, while Angela brings them food from her home."
http://www.logan.com/loganberry/most-blyton.html

A young reader gave this review of the book:
"Hollow Tree House by Enid Blyton
It was about kids that run away from their wicked Auntie. They find a
hollow tree and make it their home. It was magical. There were pixies
and fairies in it."
http://english.unitecnology.ac.nz/kidsread/share/review.html?book=HollowTreeHouse


I?ve had some trouble sourcing the book for you as it is out of print.

This site has 2 used copies in the UK
http://dogbert.abebooks.com/abe/IList?AID=7169465&PID=721570&submit=Go&ph=2&stext=hollow+tree+house&sby=tit

On ebay
3 days to go
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=3595115651&category=1100

Just missed it on ebay, not sold ? try contacting the seller
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=3592051286&category=53688

You may be able to order a used copy through Amazon.com
http://www.amazon.com/exec/obidos/search-handle-url/index=books&field-titleid=1564708&ve-field=none/qid=1079554145/sr=12-1/102-8330391-6696126

or Amazon.co.uk
http://www.amazon.co.uk/exec/obidos/ASIN/0099472201/qid=1079554247/sr=1-2/ref=sr_1_8_2/026-6051360-7526851
http://www.amazon.co.uk/exec/obidos/ASIN/0603553869/qid=1079554247/sr=1-3/ref=sr_1_8_3/026-6051360-7526851


I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder


"enid blyton" boy girl "run away"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22enid+blyton%22+boy+girl+%22run+away%22

"enid blyton" "hollow tree house"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22enid+blyton%22+%22hollow+tree+house%22

I'm not sure if it's the same book I read as a child but 'The Far Away
Tree' or 'The Magic Faraway Tree' are the titles that popped in head
when I read your question. Both books (or could be the same book) are
also from Enid Blyton.

Thank you! It is indeed the "Hollow Tree House." I remember the aunt
and uncle now.  Now I have to purchase it!