Ford Mondeo {58 Reg} TDCi - Clattering Dieslel - Samonty

Some days my car sounds like a an old stye diesel lorry {clatter ,clatter} when I put my down as I accelarate up through the gears. Other days it as quiet as the petrol car I used to drive. I'm new to diesels having always driven petrol models, is this something that is normal to diesels. There is 28K on the clock

Ford Mondeo {58 Reg} TDCi - Clattering Dieslel - Peter.N.

They tend to be louder when cold and when the air temperature is low but should quieten as they warm up, if yours is noisy when hot I would suspect that you have an electronic control problem or possibly a faulty injector, you really need to get the fault codes read.