Also, Jilly isn't in the same league as those old hacks Jackie Collins and Judith Kranz et al, she's acres above them IMO.
Her writing isn't chick lit at all, her work is peppered with literary and artistic allusions, some fairly obscure (they passed me by in my 20s but I've recently looked some of them up, which has been interesting!) her characters are brilliantly written and her descriptions of the Cotswold countryside are outstanding - it feels like you're there.
I saw her interviewed in person by India Knight years ago, who said similar about her and remarked (to Jilly) that "you wear your learning lightly"
I don't think Jilly was a snob actually, despite mixing in very posh circles, I think she liked people in general and was interested in them, which is what made her such a fantastic writer.
That's why she was loved, because she was a fantastic writer and observer of people. Maybe because she was a journalist before she wrote her novels and because she spent a lot of time in that upper middle class and posh world and it was one she knew well. It was full of crumbling piles and horses and dogs and lecherous men and beautiful women.
She also wrote about women who genuinely enjoyed sex (Chessie, Janey) which was unusual for the time. And women who worked! Janey, Lizzie Vereker, Cameron Cook. Again, in those days when a woman got married the question was sometimes (often?) asked "will you work once you're married?"
I remember the 80s well. It was sexist, racist, misogynistic and homophobic. But amongst all that Jilly gave us joy and escapism and laughter. I love love love her.