Sir: Duff Hart-Davis's conundrum over finding walnut shells within his walls (Weekend: 18 November) may be explained by the use (so I have been told) of nutshells as insulation by builders even during relatively recent times. As a chartered architect, I have seen them in Victorian construction.
Yours faithfully,
Peter Hurcomb
Bandar Seri Begawan
Brunei
22 November
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