As the fallout from the Iran conflict continues, the price of diesel has soared to record highs in the UK, Europe and US. With his country facing an increase of 70% in costs compared with this time last year, Donald Trump is threatening a ban on US diesel exports to keep costs low for American consumers. But the plans have been met with alarm – the UK is holding talks with US counterparts to try to block the move, which France says would be ‘catastrophic’ if introduced. Lucy Hough speaks to energy correspondent Jillian Ambrose – watch on YouTube