The cargo will be the UK's largest ever LNG delivery and will be used in the commissioning of the Phase 2 expansion of the Isle of Grain LNG import terminal in Kent.  The terminal is owned by National Grid with Centrica owning rights to import 3.4 billion cubic metres of gas each year for the next 20 years. RasGas will use one of the new generation of high capacity Q-Flex super-tankers, the Al Khuwair.  It is among the world's largest LNG carriers and the largest gas vessel to call at a British port. The tanker will deliver up to 50 million therms of gas, enough to supply around 4.5 million British Gas customers' homes for a week. This volume represents around 35% of total UK demand on an average winter day.