Plastic-eating enzymes | Class in the north | Brown cars | Spring politics | Female newsreaders | Comet Thatcher

I hope the artificially created enzymes will begin to help clean up the exponential increase in plastic waste (Researchers make plastic-eating mutant enzyme better, 17 April). Maybe better not to let the cultivated variants out into the wild though – and on no account call them Mutant 59
Dr Hilary Gee
Grange over Sands, Cumbria

• Maxine Peake claims “there is only one class in the north, and that’s working class” (Arts are still preserve of middle-class people, study concludes, 16 April). So who are all those people buying quinoa with bulgar wheat at Waitrose in Wilmslow?
David Hoult

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