With regard to the unconventional revolutions, and what they mean, Mr Simpson pointed out that the in the United States, a combination of horizontal drilling and hydraulic fracturing is unlocking massive amounts of resources. Conventional oil and gas output has long been in decline in the US, but that is more than compensated by a surge in unconventional oil and gas that we see extending well into the 2020's. The IEA further indicated that with our current knowledge of the resource base, they did not expect the growth in Light Tight Oil to be as large or as sustained as the growth in production of shale gas. But light tight oil will help to ease global oil markets over the medium term - that's a welcome development following several years of exceptional market tightness. When it comes to energy security, that market tightness left very little spare production capacity in the system. So it is particularly susceptible to supply shocks. So when the Libyan revolution came along and production was cut for example, the situation called for a coordinated release of strategic oil stocks onto the market. But suffice to say that already we have seen some easing of prices thanks to demand-side reasons but also extra supplies, and both Canadian oil sands and American light-tight oil are contributors to that.