Investigators reject lower 75% duty for concentrates used by Pernod and Diageo; commerce ministry assurance yet to resolve issue as dozens of shipments stuck at ports. Investigators' memo puts spotlight on Scotch dispute linked to India-UK pact Memo says bulk Scotch is a compound preparation, not finished whisky India investigators ask customs officers to charge 150% duty About 80% of Scotch shipped to India arrives in bulk NEW DELHI Indian customs is.