By Amanda Evans Linda Nolan says a postcode lottery is denying a life-extending treatment to secondary breast cancer patients. The drug, Enhertu, has been rejected for use by the NHS in England though it is already prescribed in Scotland. Mirror columnist, singer and TV personality Linda is now calling for readers to sign a petition urging authorities to make the drug available to everyone in need of it. Launched by charity Breast Cancer Now, the online petition last night had more than 46,500 signatures. Linda, 65, said of blocking the drug: “This is truly frightening and I’d urge readers to …