Quince jelly - NOT amateur radio

On a walk around the village last week we chanced upon these quinces which were free. I think some quince jelly is called for! I have never tried eating (or making) this.

See https://www.bbcgoodfood.com/recipes/quince-jelly.

UPDATE 0930z Tuesday:  2 jars made, but they are not set. Adding more sugar and boiling again.