Melanie Blake “knows a lot of bitches” in showbusiness. The 46-year-old author – who ran a talent agent for two decades before releasing best-selling novels ‘The Thunder Girls’ and ‘Ruthless Women’ based on her experiences in the celebrity world – claimed that “all of her leading lades” are based on stars she has worked with but kept tight-lipped about revealing any names. She said: ” I can’t [say who] I’m afraid – the lawyers will be watching! But you can work it out for yourselves when you read my books. All my leading ladies are based on characters I know or have been told about, so that’s …