His works were withdrawn from libraries and bookshops and his name was not mentioned by the official Bulgarian media until 1989. The Bulgarian Secret Service opened a file on Markov file under the code name "Wanderer." In 1974, his play "To Crawl Under the Rainbow" was staged in London, while in Edinburgh the play "Archangel Michael", written in English, won first prize. The novel "The Right Honourable Chimpanzee", co-written with David Phillips, was published after his death. In 1975, Markov married Annabel Dilke. The couple had a daughter, Alexandra-Raina, born a year later.