They are easy to find, round that bit near the cinema (Boongate?) If you google their name they have a map on the site. No need to book.
They put me in a neutral shoe and analysed my gait in that, found that I overpronate on the left foot so came out with a selection of about 10 different pairs before finding some that corrected that and were a perfect fit.
I can run faster outside than on a treadmill too...I always feel a bit freaked out trying to go fast on a treadie and think I am going to fall off. Then there's the fact that you get so HOT and its so BORING.