I have a 10 plate Le Mans with 3G+ MMI and it have 2 SD card slots. These are for media (Audio only) playback. Also, slot 1 is for MMI and Nav updates.
When I got mine, 2 years ago, had 77.5k on the clock so yours seem good milage. Make sure it had all time belts done at the right time.
Let us see what did you got