Which section of the MOT did it fail under?
http://www.motuk.co.uk/manual_360.htm
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The only things I can see that might apply:
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2.
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Check all components for security, condition and operation.
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2.
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A braking system component:
d.
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retaining or locking device missing or insecure.
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or
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3.
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Check all braking system components for any inappropriate repair or modification
3.
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A braking system component inappropriately repaired or modified.
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They shouldn't fail an MOT though providing they are securely mounted, not corroded
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(HEL are stainless so that's not an issue), not twisted or otherwise incorrectly installed or damaged.
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