Having been let down by the post today I am going to brew a bitter, however will have to change the hops slightly. Original recipe was 60 mins 10g Challenger 10g Northdown 10g Target 10 mins 10g Challenger 10g Northdown I was hoping my Target and Northdown would arrive today, no show. So, I will substitute Target with Fuggles. Re Northdown, Challenger seems to be a suitable substitute. So my question is, do I simply double up on Challenger, both appear to have similar hop AA count.