Cadenhead’s MPM Diamond Distillery Aged 14 Years. Another bottling from Cadenheads to celebrate their 175th Anniversary. This time from the Diamond Distillery or DDL (Demerara Distillers Limited). Today we are looking at a rum which was produced on the famous Port Mourant Still. We know this from the MPM legend on the label – Main Port Mourant (or something like that).