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It could be the high pressure fuel pump, assuming that engine is direct injected. It shouldn’t be loud enough to hear from inside the car though, mine sounds like someone whacking a rock with a hammer when the engine is cold and still can’t hear it inside the car.

Hi Mark As John said in his reply with out hearing it almost impossible to diagnose. From your description you say you can hear it inside but not outside, have you opened the bonnet? As your car is a manual does the sound get louder or go when you put your foot on the clutch? Dave

Morning Mark Is the tapping noise heard when the car is stationary? Or only when moving ? Does it increase become faster with speed ? If not heard when the car is stationary (engine running) and revved then it probably isn't engine have the belts and pulleys been checked ? If it is only heard when moving then it could be something stuck in a tyre ? an issue with the drive train, gearbox Prop shaft rear axel. It could be a suspension bush or something loose and rattling (heat shield) is it always on the same piece of road More questions than answers I am afraid, but you would feel pretty dumb if you went to a Dealer (or any Garage come to that) and it is a stone in a tyre !! Dave

Hi Mark Welcome to the group. Impossible to tell without hearing the noise. If it's worrying you and you have warranty, ask the dealer to check it out. Alternatively if you have a friend or two that is/are knowledgeable about cars, ask them to have a listen and give their opinion. Hope this helps John