Many of the books below are out of print, but you could try good second hand books sources such as here or here

Domino's Effect (novel 1998)

Golden Apples (novel 1999)

Grumper's Farm: farmyard stories to be read aloud (with Libby Purves 1996)

In at the Deep End (1986)

Pulling Punches; A traditional farming year (1988)

George Soper's Horse (1990)

Farming Times/Second Crop (1993)

Ham and Pigs (1995)

The English and their Horses (1988) with Libby Purves

The Sailing Weekend Book (1982) with Libby Purves

Can Cows Walk Down Stairs?

Do Cats have Belly Buttons?

The Last Man Across the Atlantic

Maritime Britain

The Traditional Farming Year

The Nuts and Bolts of Life

Home Farm