In retrospect, Nettleship described himself as "a short-tempered chemistry teacher with long hair ... [and a] gloomy, malodorous laboratory" who enjoyed picking on students, particularly bright students like Rowling. Which was why it was kind of weird that it took reporters straight up asking him if he was Snape before he figured it out. Even his wife knew the connection, but, tellingly, was too scared to bring it up.
Via Wales Online
It looks like somebody has been hitting the butterbeer hard.
The bad news is that sadly, Mr. Nettleship passed away from cancer in March 2011. The good news is that he lived long enough to know that in the end Severus Snape was (HONKIN' BIG SPOILER ALERT) the hero of the whole damn series.