Preheat oven to 200C/390F (standard) or 180C (fan).
Place Vegetable ingredients in a large bowl. Toss well to coat. Add sausages and toss briefly, pour into pan, move sausages to top.
Gravy - In the same bowl used for the vegetables, add butter and flour. Whisk. Add a bit of beef broth and whisk, then whisk in remaining broth. Pour down the side of the pan (don’t pour over the sausages or veggies).
Optional: Spray sausages with oil - browns slightly better (especially lean sausages).
Bake 25 minutes. Turn sausages. Spray again with oil (optional) then bake for a further 25 minutes or until sausages are browned and potatoes are soft.
Serve Sausages and Vegetables with Gravy on top, garnished with fresh thyme leaves if desired.
