Air-fryer or oven-cooked fish & chips

Name: Air-fryer or oven-cooked fish & chips
Prep time: 25 min
Cook time: 45 min
Total time: 1 h 10 min
Cuisine: British
Ingredients: 45ml rapeseed oil plus extra for the racks; 1 kg floury potatoes (such as Maris Piper); 400ml malt vinegar; 1 tbsp cornflour; 2 tbsp olive oil; 150g panko breadcrumbs; 1 lemon zested, then cut into wedges; small handful of parsley finely chopped; 100g plain flour; 3 eggs beaten; 1 tbsp Dijon mustard; 4 x 200-250g boneless, skinless white fish loin fillets (such as haddock or cod); 8 cornichons finely chopped, plus a splash of the pickling liquid; small handful of dill finely chopped; 300g mayonnaise; 350g fresh or frozen peas (defrosted if frozen); 25g butter; 1 lemon zested and juiced; small handful of mint leaves finely chopped