Gorgeous gooseberry which I had on toast this morning, I have frozen my blackcurrants for future jam. My jams will store for years, I am meticulous with temperature, sterilising etc. A good tip is a tsp of a strong alcohol on top and I never use wax circles. My marmalade is best matured for years, absolutely gorgeous. When I make jam or bottle fruits, I always make sure to get the all important pop as the vacuum sets in
I have lots of 500ml kilner jars, the old style screw tops and you can lift the jars by holding the thin lid. The vacuum holds it very tight so it has to be pierced to open