classics for kids to get lost in

Someone may be able to recommend others but here are some I've either read or found.

The Voyage of the Beetle - Anne Weaver
Mrs Marlowe's Mice - Frank Asch
The Curious Adventures of the Abandoned Toys - Julian Fellowes
Ferdinand the Bull - Munro Leaf
The Peterkin Papers - Lucretia Hale
The House of Arden - E. Nesbit
Jenny and the Cat Club - Esther Averill ( a series )
The Island of Horses - Eilís Dillon
Wee Gillis - Munro Leaf
Episode of Sparrows - Rumer Godden
The Doll's House - "
The Little Bookroom - Eleanor Farjeon
Jenny's Birthday Book - Esther Averill
The Once and Future King - T. H. White
Mistress Masham's Repose - "
The Adventures of the Little Wooden Horse - Ursula Moray Williams ( part of a series )

The Secret Garden, The Magic Faraway Tree,The Waterbabies

Anything by Astrid Lindgren, especially Pippi Longstockings.
Anything by Michael Ende, especially The Never-Ending Story.