MOT fail - Brake Pipe Inadequately Clipped

[tigerstyle]

Had my HDi Estate fail an MOT the other day, one of the fails reads as:
Nearside rear (to flexy clip missing) Brake pipe inadequately clipped [3.6.B.1]

I haven't had it jacked up yet to look at the problem, but from googling the best  I can come up with is it's going to be the 'U' clips on the flexy, one might have rusted through?
Anything else maybe so I can get the bits sorted? 

Picture not mine but for reference:
 

[swampy]

The copper lines also run through clips on the body

[daddyfixit]

on that pic were red flexi joins copper pipe, they pass through a black bracket---theres usually a horse-shoe clip to secure them .

[tigerstyle]

thanks all, will follow the whole pipe from cylinder to master cylinder!

[Poodle]

If it specifies flexi as per your op, then it'll be around the flexi.