https://pacheco-torgal.blogspot.com/2020/04/your-polytunnel-needs-you-not-enough.html
It seems that this is not just a UK problem !
https://ec.europa.eu/eurostat/documents/2995521/10294480/3-16032020-AP-EN.pdf/3883a031-8e8a-3dd1-c513-8a294c685616