By Adam Bloodworth I’m under strict instructions not to ask Benedict Cumberbatch anything personal. “He doesn’t do profiles,” I’m warned ahead of our interview. Arriving at the posh London hotel hosting the press interviews for his new six-part Netflix drama Eric, a publicist pulls me away from a pile of shiny pain au chocolats to whisper the rules once again, just to be sure. It’s understandable. The 47-year-old had a stalker break into his garden last year, digging up plants and throwing them at his windows, while he was inside with his wife and three children. Relaxing on a cream sofa in on…