1. Defra's latest figures show that 51% of all the food we eat is imported. Certain lunatic elements in the UK are suggesting that we replace this 51% by growing our own.
2. Say an adult male requires 2,400 calories a day. Especially if he spends it grubbing in the dirt with a stick. We need to replace (2,400 x 51%) x 365.25 calories a year; 447,066 calories a year.
3. 1kg of potato contains 790 calories. Each of us would therefore need to grow 447,066 / 790 kg of spuds a year; 566kg of potatoes a year. Potato yields are say 8 tons / acre, or 8128kg / acre.
4. Each person in the UK would therefore need a bit less than a tenth of an acre. Multiplied by 60m people this comes to an additional 5.8m acres under cultivation. That's about 23,600 sq km.
5. Wales is 20,764 sq km in area.
Right. Carry on.