LinkMr Alldus, 37, who is Lambeth's Lesbian, Gay, Bisexual and Transsexual (LGBT) liaison officer decided to enrol after reading about an HIV-positive officer working in Lambeth in Positive Nation magazine.
"I thought it showed how much attitudes within the police had progressed," he said. "My father was a police officer for 30 years until 1977 and for two-thirds of that time it was illegal just to be gay.