Thank you, thank you everyone for these wonderful contributions!
I have got nearly everything I need, gathering together a few more jars - how kind of you, Frances, to remember your jar collection ! I wish we lived a bit closer... Would Miss Jukes be proud of me? I doubt it!

(I know we did Food Preservation with her, but strangely, all I recall is layering some green beans in a jar with salt; a procedure which I have never needed to repeat.)
John, I was very interested to read that the bitter Seville oranges are for export only - a bit like sweet sherry, I suppose! I also make a ginger infusion - I love it - a delicious drink! I've never forgotten hitchhiking to Morocco after I left school, and being deposited in Madrid by a van driver. The street was lined with orange trees. I thought that was just gorgeous!
Thanks for the links to all those recipes, David, I've had a lovely time checking on them! A pineapple marmalade is a superb idea! I think I may begin with a three-fruit marmalade - have found a source of lovely pink grapefruit and a special offer for lemons. I'm also the proud new owner of a funnel for spill free pouring into jars. I've located a Womans' Hour recipe for a jelly marmalade which sounds heavenly - but possibly not for the beginner.
A marmalade I especially remember is Roses Lime Marmalade - a favourite on home jam days at CH. I see it in my mind's eye on the tea table next to Marmite, Sun Pat Crunchy Peanut Butter, and Chocolate Spread in a red-and-white waxed carton. The Lime Marmalade came in a rather terrific faceted jar - very attractive.
Many many thanks again for all the advice/tips/ inspiration!
"Baldrick, you wouldn't recognise a cunning plan if it painted itself purple, and danced naked on top of a harpsichord singing "Cunning plans are here again.""