450g/1lb floury potatoes (such as King Edward or Maris Piper), peeled and cut into chunks
60²µ/2½´Ç³ú gherkins, roughly chopped
4 tbsp finely chopped fresh flatleaf parsley
75g/3oz shallots, peeled, finely chopped
125g/4oz mixed watercress and baby spinach leaves
4 tbsp capers, drained, roughly chopped
50g/2oz plain flour
salt and freshly ground black pepper
75g/3oz dried breadcrumbs
vegetable oil, for deep-frying
50g/2oz butter
4 free-range eggs, 2 hard-boiled, 2 beaten
500ml/17½fl oz milk
700g/1lb 8oz smoked haddock fillets