The talk of gooseberry and strawberry jam reminded me of when the kids were at home. I had lots of gooseberries but had to buy strawberries and they loved strawberry jam but professed to hating gooseberries. I mixed the two at first with quite a high ratio of strawberries but over the years it became much more gooseberry than strawberry. They never knew and still thought it was strawberry jam.
As for adding elderflowers, I put them in a muslin bag which is removed and squeezed before adding the sugar.
Dame Jenni Murray died due to dazzling headlights
. annodomini .. your gooseberry and elderflower ice cream sounds devine.