I attended last Thursday 7th August for interview at London city, chatted to a couple of other people there of which none of us had taken the aptitude test. It was mentioned that this would be done in Dublin along with Sim if we were called back to do so.
Thats how it happened for us! We were also told we should hear something by next Wednesday with regard to the Sim, whether it be positive or negative
The next Sim checks have been set up for the 15th August I believe.
Good luck
regards
Yorky