April 23 (Reuters) - Britain's FTSE 100 index is seen opening 8 points higher at 7,376 on Monday, according to financial bookmakers. * SHELL: Royal Dutch Shell, PetroChina, South Korea's KOGAS and Japan's Mitsubishi Corp are moving ahead on the long-stalled LNG Canada liquefied natural gas project after a rise in energy prices, Japanese business daily Nikkei reported on Saturday, without citing sources. * BARCLAYS: A whistleblowing case at Barclays Plc is expected to set its top