Young Adult Fiction--British Farm cat named Trouble

This is a young adult book and I have forgotten the title. It's set in England farm country. The cat character is a black cat named Trouble. There is a bull named Sultan, another cat named Silver Cat and a number of human characters whose names I cannot remember. The human characters include a farmer and his wife who I seem to remember are named Liz and Joe. Their neighbors from America who are Jill and Paul - they have two children a boy and a girl whose names I cannot remember. I have a niece who adores cats and is just the right age to be reading this so I wanted to get it for her for her birthday, if I could only remember the title. I read it as a mid teen back in the early 70's so I am assuming it was written between the mid 60's to early 70's

I suspect it is Casey, also known as Born to Trouble by Joyce Stranger.

I believe she based Casey on her own Siamese cat, which she wrote another book about, called Kym.

Born to Trouble (Casey) by Joyce Stranger.
Life at Wayman's Corner could never be dull. Crises lurked around every corner ... marital friction, careless city visitors, farmyard accidents and Casey.
Casey, son of a Siamese tomcat and a black farmcat, was an animal with great determination, strong affections, and a nose for mischief, whose strange friendship with Sultan, the terrifying Jersey bull, becomes a central part of life on the farm ...

That's it, thank you so much.