Here is the recipe from the book W.I Jams,Pickles and Chutneys

I'm making this later so will update this post to let you know what it's like and if it tastes good I'll add the recipe to my separate page.
UPDATE
It works and tastes delicious.
As Pat says in comments - people on statins shouldn't eat grapefruit and it does have a HUGE amount of sugar in it. I've put the recipe on my recipe page with more details.
Welcome to some more followers, hope you enjoy reading.
Back Soon
Sue