Air fryer fish and chips with tartare sauce

Name: Air fryer fish and chips with tartare sauce
Ingredients: 350g/12oz potatoes, such as Maris Piper or King Edward, sliced into 5mm/¼in-thick chips; 3 tbsp olive oil; 2 x hake, cod loin or haddock fillets, skinless and boneless (approx. 150g/5½oz each); 2 tbsp plain flour; 1 free-range egg; 60g/2¼oz panko breadcrumbs (see recipe tip); salt and freshly ground black pepper; lemon wedges to serve (optional); 10g/⅓oz fresh rosemary, leaves picked; 3 tbsp sea salt; 1 lemon, zest only; 3 tbsp mayonnaise; 1 tbsp Greek-style yoghurt; ½ lemon, juice only; 1 tbsp capers; 5 cocktail gherkins, finely chopped; 1 tbsp flatleaf parsley, roughly chopped; pinch smoked paprika