GUYS IT IS VERY IMPORTANT that if you are completing you training along a modular route that you have your IR ISSUED (thats a printed licence from the CAA in your hand) before you start any MCC course. It is a JAR-FCL requirement and is detailed to this effect in LASORS.
Schools have recently been informed (via letter) by the CAA that MCC's carried out before an IR has been issued will be deemed invalid and schools have all been asked to take copies of a students licence before they start an MCC course - these must then be kept on record at the school.
Intergrated students are a different story and at an approved intergrated school, these students can complete their MCC before any of their licences are issued.
Any questions contact the CAA, read this
http://www.caa.co.uk/docs/175/Section%20F%20-%20TYPE%20AND%20CLASS%20RATING%20(AEROPLANES%20AND%20HELICOP TERS).pdf