Born in London, Adamson is of Turkish Cypriot descent. He played Ali Osman in the BBC soap opera, EastEnders, a role he played from the series' inception in 1985 until 1989. During his stint on the show his character battled with the loss of a child, gambling addiction, the breakdown of his marriage to Sue (Sandy Ratcliff) and her subsequent mental health problems. During EastEnders he was credited as Nejdet Salih, but after his departure in 1989, he changed his name to Nej Adamson.