General ACCASeptember sitting - Birmingham or London?

Hi all I want to sit an exam in September so I will have to travel to London or Birmingham. I am trying to work out which will be easiest to get to, the problem is I don't know where in London and Birmingham the exams will take place in. Both cities are very large with multiple train stations. Does anybody have any idea where ACCA are likely to hold the exam in both cities? I live in between both cities so will have to plan my way to the exam centre carefully to get there in time on the day. Thanks