What is the most posh, tasty preserve/conserve money can buy?

Hi! I'm looking to get some preserves/conserves and marmalade for my in-laws. They live abroad and I really want to get them some proper English jams. I've looked at Fortnum and Mason and Marks and Spencer but dunno which are better. I have read mixed reviews on both with some finding them too sweet; looking for something with little sugar and more fruit.

Interestingly, Kew Garden's ad popped up on my feed; a strawberry, rhubarb and vanilla jam! So I'm open to other brands too. Any company that does mini/sample sets would be amazing too because then I can try them and pick out which ones to get in full size.

P.S. I know a lot of people might recommend the F&M champagne and Strawberry preserve. We don't drink so nothing alcohol please. Thank you!