I just had an email from last year's source of Seville oranges. I still have half of my purchase in our big freezer, having used 2 Kg to make marmalade already. Buy some of these, if you're thinking of making marmalade, it will be excellent, especially if you follow the recipe on my blog...
https://mailchi.mp/parrishfarms/merry-christmas-from-parrish-farms-14180428