Thank you very much for your help and quick reply.
To be honest with you the result is not quite what I have expected.
Just recently I have purchased a collection of WW2 medals awarded to Lt. Stanislaw Grzasko, Polish 2nd Corps, 11th Battalion - Signals.
There were four Polish and four British medals in total. Among them was the MCC Nr 3254.
From my own research it seems that he was indeed awarded all of them (including MCC). It is unclear how someone else's MCC ended up in the collection.
Now I wander what was the MCC number awarded to Mr. Grzasko, or if the MCC No. 3254 in this collection is indeed genuine?