Brilliant Nibble, thank you so much. I've made other jams before but never strawberry as it's supposedly difficult to set. Fingers crossed it turns out ok!
Try using the sugar with pectin added. I have always had trouble getting strawberry jam to set, but I used jam sugar last week and I was really pleased with it. The recipe is on the pack. 800g strawberries to 1kg sugar.
It is very difficult to set. You should add either gooseberries or pectin. Gooseberries have a great deal of pectin, and make very little difference to the flavour of the jam, but strawberries alone will not result in a decent set.
Well folks it's made - and appears to have set pretty well! It's maybe a little runnier than other jam I've made before but it's set nonetheless! Thanks for all your help x