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Except on a very smooth road there are noises coming from the rear of the car. If the foot brake is very lightly applied the noises stop. Any ideas please.

Sounds like the brakes may be glazed this can occurred with lots of low speed city driving and lite brake application, You could try high speed braking this may improve your noise issue. Ultimately a permanent solution could be a new set of semi metallic brake pads Repco thermo quiets are pretty good, and a brake skim if they are within specifications.