The Government has recently published guidance on provision of childcare for children whose parents work in categories critical to the COVID-19 response. The critical sectors are listed in this guidance, and include a number which are relevant to Defra sectors:

Those involved in food production, processing, distribution, sale and delivery. This does encompass all areas of food supply chain (i.e. farming, fisheries, animal feed and other downstream elements of the food supply chain).

The guidance letter can be found at:

And further guidance from the UK Government: