Preheat the oven to 350°F.
In a 10" x 3" plastic tub, place the flour, egg, salt, seasoning, milk & melted butter. Blend really well using an immersion blender - or liquidize & pour into the tub. (The tub just makes it easier to apply the batter to the fish.).
Rinse your fillets & cut into 5" pieces. Dust each piece with a little flour.
Heat your fryer to approximately 350 F
Dip the fillerts one by one in the batter & coat both sides evenly.
When the oil has reached the correct temp, gently lay one fillet at a time onto the top of the oil.
Cook until golden brown on both sides - takes me about 4-5 mins, then remove & place on a tray with a wire rack (I use the grill pan) in the oven to stay crisp & hot.
Repeat with the remaining fish.
Serve with chunky chips, peas (mushy is best!) & lots of salt & vinegar -- .