Pre-heat the oven to 200 degrees Celsius.
Measure out the flour and milk. Combine into a bowl with the salt and egg then whisk it all together to make the batter. Set this aside.
In a small deep baking tray, drizzle the oil over the pork sausages and give it a shake to make sure the sausages are coated. Roast in the oven for 15 minutes.
Take the dish out and pour the batter mixture in with the sausages and roast for a further 30 minutes.