Can I just butt in and say that last year's glut resulted in two or three dozen jars of jam, although I may try to make jelly this year, but the best use I have found for them is making Bramble Whisky. Split a litre bottle of scotch between two 75 cl bottles, packing in as many blackberries as will fit, leave to steep for six weeks, turning them upside down occasionally to stir, then strain through muslin and add sugar syrup to taste before bottling and storing.You can add sugar at the outset, but the depth of fruit flavour seems to be better if you add it afterwards. its also harder to be precise with your personal preference for sweetness, as some brambles are much sweeter than others. Matured until Crimble or beyond is best, but It may not last that long. Hip flask heaven for those cold days out in the country.
I tried a recipe for Apple and Blackberry Gin, with a pinch of cinnamon for a really Christmassy flavour, but it wasn't my favourite. That had to be the Damson Gin.
Hic.