Salted codfish fritters with garlic mashed potatoes

Name: Salted codfish fritters with garlic mashed potatoes
Ingredients: 3pounds (1 ½ kg) salted cod or salted cod fillets, skinless; Flour for dredging; Olive oil for frying; 1 ¾cups (250g) all-purpose flour; 1 teaspoon baking powder; 1 ⅓ cups 330ml beer, cold; Salt, pepper; 1 pound 1/2kg russet or baby potatoes, skins on; 1/2cup (120ml) olive oil; 2 tablespoons white wine vinegar; ½ lemon, the juice; 3-6 cloves garlic, minced; Salt, freshly ground pepper; Chopped spring onions for topping