The officer, who is still undergoing rehab, said: "I've made significant progress, obviously, since that night. I'm much more independent, much more able. I'm standing, I'm walking, I'm talking, I'm able to socialise again, see family and friends."
He conceded his family still have concerns about his return to work but said, "It's a job that I enjoy. It's who I am, to be honest."
He had a series of operations and spent almost three weeks in hospital following the attack, and said when he was bedbound it was messages of support from the public, often complete strangers, that encouraged him.
Marques, who was born in Birmingham but lives in south London, said he had read as many of the public's messages to him as possible, describing the response as overwhelming.