A suspected oil spill in a river is causing a city to “stink of diesel”. The “slick” was spotted in the River Stour in Canterbury city centre this morning. Kayleigh Gogerly took a video showing a rainbow sheen on the water outside the Marlowe Theatre at around 9.20am. She has reported it to the Environment Agency (EA). The 38-year-old, who works as a caretaker in the Marlowe, says she is worried that wildlife in the area could be affected. “I haven’t got a clue how it is been caused but it’s not good for the wildlife,” The Faversham resident said. “It’s also not a good advert for the city as i…