Sacrificing agricultural land for purposes that can be provided for adequately through other means (i.e. on brownfield sites) goes against twenty-first century sustainability imperatives. Governments around the world, including our own, acknowledge declining food security and increased competition over resources in an era of worsening impacts from climate change as critical strategic trends (Ministry of Defence 2018). Authoritative bodies such as the Royal Commission on Environmental Pollution, in its report on the Sustainable Use of Soils, have warned that:
'A continuation for a further 100 years at the average rate of transfer to urban uses between 1945 and 1990 would come close to doubling the urban area of England and reduce the area of land cultivated or used for pasture by perhaps as much as a sixth. That would represent a significant reduction in the UK's capacity to produce food' (RCEP 1996, para 2.23).

Simply put, now is not the time to be re-designating productive agricultural land (presumably in effect irreversibly) for purposes that I believe have already been provided for elsewhere (through designated industrial sites). Though small in national terms, this proposal needs to be viewed as part of a larger scale, incremental trend in land use that exposes society to significant future risks. I write in a personal capacity, as an academic based at the University of East Anglia, affiliated to the Tyndall Centre for Climate Change Research. I also have parents-in-law living in the village, so that I am a frequent visitor.

References:
Ministry of Defence (2018). Global Strategic Trends: The Future Starts Today. 6th Edition.
Royal Commission on Environmental Pollution (1996). Sustainable Use of Soils. 19th Report. London: HMSO.