Grating sound on start up

When starting the car a grating sound is sometimes heard from under the bonnet any ideas ?.

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You need to give more info. How old is the car? Does the engine turn when the sound happens? It could be just a vibration, but alternately a broken tooth on the flywheel, which requires pulling the transmission (a day's work in a dealer or specialized transmission shop). Only a mechanic can tell for sure.
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The car starts ok but just before i let the ignition go the grating kicks in. It sounds like somethings just missing or catching , forgive my complete lack of savvy on this, thanks.

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