Toast breadcrumbs: Spread breadcrumbs on tray. Spray with oil, bake 4 minutes until golden. Transfer toasted breadcrumbs into bowl, add remaining Crumb ingredients and mix.
Increase oven to 220°C / 425°F (fan 200°C). Spray used tray with oil.
Batter: Mix Batter ingredients in a separate bowl.
Cut the fish into strips 1.5 x 11 cm / 3/5 x 4.5" (they shink 30% in length).
Place fish in Batter, gently mix with rubber spatula to coat. Do not leave sitting around (will become watery), coat immediately.
Breading: Pick up fish with tongs, place in breadcrumbs. Spoon over crumb, use fingers to press to adhere.
Baking: Transfer to baking tray. Spray with oil, bake 13 minutes or until crispy on the outside.
Serve immediately with lemon wedges, Tartare Sauce or other Sauce of choice - see here for recipes, any of these great for fish fingers! Also Note 3 for few quick sauce options.