Next stir in the porridge oats and one tablespoon of blackcurrant jam until completely combined. Then tip half of the mixture into the pre-greased tin and press it down with the back of a spoon. Then spread the rest of the jam over the flapjack. Next tip the other half of the mixture on top and spread it out into all the corners and compact it with the back of a spoon. Then place it in the pre-heated oven for 18 - 20 minutes until golden brown. Once cooked leave to cool completely.