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Knocking /bubbling sound

Been driving around wales the past few days and have just noticed an odd noise - a sort of grinding/bubbling /knocking sound. Car only makes sound when feet are OFF all pedals and rolling. As soon as any pedal is used, the noise stops. Noise occurs in all gears, however , when in 1st or 2nd and and going very slow, the sound is noticeably slower, but not consistent with wheel rotations. Very odd. No warning lights come on, and car drives fine otherwise. Recently had a full service and a few fixes - exhaust, brake pads and rust weld above front driver’s side Wheel.

Any thoughts ?