Fish with mushroom sause , boiled potatoes and veggies

First time last night i cooked fish!, i wrapped it in foil and baked in an oven for about 45 minutes on gas mark 6.
i made a home made mushroom sause out of about 5 medium/big mushrooms i chopped down, and seered them in about 1/4 of a cup butter ( heated the butter up first), then added 1/4 flour and slowly pored in 1liter of gravy mix in hot water, then i let it simmer for about 15-20 minutes to get the mushroom tast to it, and boiled potatoes and steamed veggies ,, im so proud of myself and feel like one succesful mummy :)