The Queen gets teased by “everybody” about her “obsession” with a specific app, a children’s author has said. Horrid Henry writer, Francesca Simon said she realised she and Camilla had to same habit when they began discussing the miserable weather in July. While attending at event in honour of the National Literacy Trust’s 30th anniversary, Simon learnt about the Queen’s “obsession” with weather apps. The celebration was due to be held outside but following heavy downpours on Tuesday, it was moved inside Clarence House. The children’s writer said: “We were laughing about our mutual love of wea…