Passage: In the late 1930s, Sahni and his wife left Rawalpindi to join Tagore's Visva-Bharati University in Shantiniketan in Bengal as an English and Hindi teacher. It is here that their son, Parikshit Sahni was born, when his wife Damayanti was earning her bachelor's degree. He also collaborated with Mahatma Gandhi for a year in 1938. The next year, Sahni, with Gandhi's blessings, went to England to join the BBC-London's Hindi service as a radio announcer. He returned to India in 1943.

Question: When did he finally make his return?
1943