I went off Jilly Cooper several books ago. She really is an awful and very unsubtle snob and I read in a review of one of her recent books that the teenage characters still talk like young upper class kids from the fifties and sixties. She does seem to be quite dated in her views and writing style.
I loved Rivals, which I read when it was first published and Tony Baddingham was still Tony Bullingham. I seem to remember there was a real Tony Bullingham in the news threatening legal action, hence the name change. Can't have done much for all the bullsh*t jokes in the book.