All councils and governmnet departments use similar stationary, office equipment etc, all bought from different sources, many foreign. Start a central buying area staffed by british workers where all their needs can be purchased. Then start a small factory, staffed by british workers to manufacture the goods. Prohibit any public department to purchase from anywhere else. British jobs supplying british public sector. No foroeign exchange involved. Simples
Why does this idea matter?
Help to reduce the economic deficit and increase manufacturing