Thanks, Christyan, I'll let Murray take the first question. I mean, I think on the second question, we all have views on the outlook for different product streams. And of course, the reality is we never quite know. I can create a very strong case for oil. Why would I do that? I think everybody is talking about global economic growth and what's happening there. Everybody is talking about what's happening in China. And yet, we probably will see an excess -- or in excess of 2 million barrels a day of demand growth in oil this year. And we expect that to continue into next year. Maybe not at the 2 million, but certainly well in excess of 1 million. So you look at that, you look at the fact that OPEC+ remains exceptionally disciplined, if not increasingly disciplined and show no sign of changing that tack. And I guess in discipline, you also look at the U.S., where I think the rig count has fallen to the lowest level now since February of last year, down by, I think, 20%. I think oil rigs down 12, gas rigs down 12% oil -- gas rigs down more. So I can create there a situation where you described the outlook for oil prices to be strong over the coming months and years. We, of course, know that there are numerous uncertainties, and we go further on plan on that basis and that's how we run the company on the basis of a $40 oil price, a $3 Henry Hub price and an $11 RMM. And we have no intention of moving away from running the company on that basis because we believe that's the prudent and right way to run the company. And if oil prices and refining margins and gas are higher, then so be it. We want to make sure that we take full advantage of that, and Murray will talk to how we allocate the surplus cash. Gas, you go through a similar story. Europe, you'd say better positioned than last. Of course, storage levels mean we're in a much better position than we were last winter. Does that mean that we're out of the woods? You can't say that. Why not? Because there was a lot of demand destruction last winter, maybe 20% to 25% in industry. What happens to that is, what does that mean, does it return? We don't quite know the weather, which we all see. So there are many things that are uncertain there. I think the 1 thing that you can expect through all of these product streams is probably a lot of volatility, probably more so than we have experienced in history. But you may wish to add to that, Murray. And obviously, then the conversation about why not more buybacks.