Non-standard Exhaust Clamp - MOT failure?

Back during the summer I fitted a new centre and rear exhaust section to my 300tdi.

The studs in the flange by the cat. were rusty and snapped off meaning I couldn't secure the middle section to the front section in the proper way so I bodged a clamp together by cutting the flange off of the old exhaust, spitting it in two, and then bolting these through to the flange on the new middle section.

Six months on the exhaust isn't leaking, nor does my bodge show any signs of having loosened. It doesn't look pretty though.

Is this an automatic exhaust fail because it isn't a proper part or so long as the exhaust isn't leaking they've got to pass it?

Correct unless this applies to u.
1. An exhaust system not adequately supported.
2. A major leak of exhaust gases from any part of the system.

I done the similar in the past with the coupling of two exhaust pipes + a load of exhaust seal without any probs, I know how to bodge as well. No need to do now days though

Well the joint isn't leaking and the rest of the system is properly supported on rubber mounts - it isn't pretty to look at though.