Daisy series by Kes Gray.
Mudpuddle Farm series by Morpurgo.
Noisy Village, Pippi Longstocking & Emil series by Astrid Lindgreen.
Isadora Moon series by Harriet Muncaster.
Puppy Academy series by Gill Lewis.
Killer Cat series by Anne Fine.
Amelia Fang series by Laura Ellen Anderson.
Polly & Puffin series by Jenny Colgan.
Stick & Fetch series by Philip Ardagh.
Arabel's Raven series by Joan Aiken.
Invincibles series by Carly Hart.
Wigglesbottom Primary series by Pamela Butchart.
Helen Peters series about various animals. A Goat Called Willow, etc.
Jill Tomlinson animal series. Penguin, Owl, otter, etc.
Ladybird Classics - Black Beauty abridged, etc.
Mary Poppins series by P L Travers.
Milly Molly Mandy series by Joyce Lancaster Brisley.
My Naughty Little Sister series by Dorothy Edwards.
Wombles series by Elisabeth Beresford.
Polly & the Wolf series by Catherine Storr.
Worst Witch series by Jill Murphy.
Royal Rabbits series by Santa Montefiore.
Princess Smartypants series by Babette Cole.
Philip Reeve & Sarah McIntyre have a few - Cakes in Space, Pugs of the Frozen North.
Mr Tiger & Betsy series by Sally Gardener.
Mrs Pepperpot series by Alf Proysen.
Harry the Poisonous Centipede series by Lynne Reid Banks.
Paddington - 13 chapter books, I think.
Animals of Farthing Wood.
The Questioneers series by Beaty & Roberts.