BlitzSTI5

Just tonight coming home round a slow sharp right hander I heard a knocking from the n/s wheel which upon inspection appears to be a problem with the brake pads/ retainers.

I've had a quick look with a torch and it looks like one of the pads has slid forward slightly and a metal clip of some type but can't make it out properly.
I drive up and down a very rough lane everyday which I think is to blame for something working loose maybe?

It seems as though this model may have a poor design for durability/safety?

I will have a better look tomorrow in daylight, but not sure what tools I need for these calipers, can anyone enlighten me please?

Cheers guys.