Miscellaneous with fish

2 Tbsp. extra virgin olive oil 1 lrg Spanish onion medium diced 2 x carrots diced 2 x celery ribs diced 1 x red bell pepper cored, diced fine 1 x yellow bell[...]

675 gm Floury potatoes, such as King Edwards     Few sprigs of mint 1 x 300 gram pie haddock fillet, skinned and boned 225 ml Lowfat milk     Extra virgin[...]