Oscarr Interesting comments on the foot balance shoe thing and the gait testing. I think its a good service that is offered in the store. I went there last year and my flatter feet, and over-pronating running style led to some supportive trainers, that immediately improved my running injuries. I bought the insoles, but I do think they are expensive, if I could buy them for say 20 pounds, I'd be keen to get another pair.
This evening I did another type of shoe testing. There was a post on Reading sweatshop about testing shoes for Mizuno, who have an office in Reading. They wanted volunteers, so I went along to test their 2014 models 
I found the experience interesting, they had about 10 volunteers when I was there testing two similar looking shoes and two different looking shoes. 4 in all, which we asked to run for 5 mins in and then write down our comments. 
Mizuno Wave Prophecy and Mizuno Wave Precison. I use the Wave Nirvana and Wave Inspire. They felt a bit different. I liked that they had loads of shoes on display, and golf clubs and lots of other Mizuno things. I'd like to work there, but I don't think they need someone with my skills 
What did I get out of it I hear you ask - a tech T shirt, and entry into a draw for running gear
I gave my top to my wife
I have loads!