Used to be if you held a MT share the you had erm... a share in MT. Now it ain't so simple as the debt that the firm had has been 'written off' (i.e. exchanged for ownership) by the banks. what that really means (i think) is that its not just the shareholders who own MT now, but the shareholders & the banks. This may well mean that in the future your 100 MT shares will become 1 or maybe 10.
Check with a friendly stockbroker is my advice but I'm glad i've turfed mine out!