A tanker full to the brim with fresh, premium filtered oil, then I'd set it on photocopy for the day.
Once we had near infinite oil in the UK, I'd approach the leader and find out how much longer we're going to continue our 'humanitarian efforts' to 'free' parts of the middle east, now that we don't need their oil, then hand it over to my country, on the public declaration of a bill that offers a free top hat and £100 for any immigrant claimant, purely to laugh at the newspaper headlines. I genuinely think the Daily Mail may in fact implode under the weight of its own vitriol.
I could then approach America, offering them cheap infinite oil in exchange for them paying for healthcare for their citizens thru taxing it, watching the fury explode as people realise they're getting cheap gas for their 4x4 AND looking after the poorest member of society, and that despite them being better off and it costing them nothing, they'll still feel angry