Ella Hickson’s new play analyses our relationship with oil using the sketch format. First, there’s a candlelit soap opera set in Cornwall, in 1889, with a lot of ooh-arr bumpkins firing witless insults at each other. Next, a bizarre Persian scene, set in 1908, where a Scottish footman (who uses the celebrated Edwardian colloquialism ‘OK’) rescues a ditzy waitress from a sex-maniac serving in the British army.