At Granada, Plowright was a vigorous defender of the often controversial current affairs programme, World in Action.
In 1998 Árpád Pusztai said in an interview on a World in Action programme that his group had observed damage to the intestines and immune systems of rats fed the genetically modified potatoes.
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After that, he quickly progressed to producer/director status, with series such as Sunday Break for ABC Television, World in Action for Granada Television and the arts programmes Tempo and New Tempo for Thames Television.
In 1971 director John Goldschmidt produced a film for Granada's World in Action programme featuring Peter Hain debating Apartheid in South Africa at the Oxford Union.