Leak from t connector - shower

[aliferste]

I have finally worked out where a leak is coming from in my shower room , it is coming from where this hose comes out the wall.
I believe the t connector is leaking.

Before I start cutting into the dry wall behind to look at the pipes is there a way of getting at b it from the front?

 

[jj4091]

Have you tried unscrewing the hose then either lever off the cover or look for a small securing screw in the aperture.