Usually that's also jam, but there are a few fruits where we call it jelly.

Redcurrant jelly: https://www.bbc.co.uk/food/recipes/redcurrant_jelly_26005

The whole jam shelf at Tesco, including "Strawberry Seedless Jam" (shouldn't that be "Seedless strawberry jam"? The adjective order sounds wrong otherwise) and "Strawberry jam": https://www.tesco.com/groceries/en-GB/search?query=jam

"Conserve" means "add £1 to the price".