I just had a free 30 min gait analyses session at the Chiswich branch as part of their Open Day.
I'm also part of a running club and get a lot of feedback from the guys there, however I was ASTOUNDED to see myself running. They film you running on a treadmill from the back and from the side, then sit you down and talk through the analysis. This was so helpful to me, as a lot of what they were explaining correlates to some on-going niggles I've been getting.
The 6 sessions for £260 sounds steep, so I'm still deciding, but the free taster was so informative and impressive I think it may be worth it in the long run. I also work at an osteopathic practice so get regular treatments there, however this running school says it can change your running form and technique, which will hopefully fix repetetive niggly issues I keep getting.
It depends what you're going in for - but I'm sure most runners wish they could be more efficient or better their technique/PBs.
If you get a chance to do a free trial session, go for it!