By Fran Winston & Charlotte McIntyre Casualty newcomer Sammy T Dobson accidentally revealed her casting in the show before the official announcement. Sammy has joined the show as junior doctor Nicole Piper. Her casting was announced, along with the other new recruits Manpreet Bachu, who plays Rash Masum’s (Neet Mohan) cousin Tariq Hussein and Jamie Glover who plays new Clinical Lead Patrick Onley, on February 8. Even though she had already been filming for months, the news was supposed to be hush-hush until the BBC officially released it. However, a cheeky picture on Instagram the night before…