Toglet is correct. Scampi is defined in UK food regulations as the whole tail ofNephrops Norvegicas which is actually a lobster. Common names for this species include Dublin Bay Prawn, Norway Lobster and Langoustine. UK regulations don't apply to scampi sold as ' breaded ' so breaded scampi is often made up of a mixture of related species and usually includes prawn, squid and the much cheaper Korean scampi. In the US and Canada scampi has a different meaning. There it refers to a dish of shrimps cooked in garlic and oil.
It is not a Lobster, it is a relation of the lobster. Common namse of the scampi are available within the Young's Sea Food web site along with further information such as colour, weight, feeding and cooking instructions.