Long-time friend, TV gardener Alan Titchmarsh, said the service was a “way of saying thank you” to Dame Jilly, who he described as “hugely genuine”.
“Such a loss of a great friend,” he added.
Broadcaster Gyles Brandreth also paid tribute to the “fabulous” and “amazing” Dame Jilly, summing her up in one word: “fun, fun, fun, fun”.
“Champagne is being popped in heaven today and I’m honoured and delighted to be here amongst so many celebrating an amazing writer,” he added.
Other guests at the service include actress Dame Joanna Lumley, Queen Camilla’s son and her ex-husband, food writer Tom Parker Bowles and his father Andrew Parker Bowles, broadcaster Clare Balding and presenter Richard Madeley.
