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Heat 1 tablespoon of oil in a non-stick frying pan. Add the haddock fillets, skin side up, and cook over a medium heat for 3-4 minutes until you are able to flake the flesh with a fork. Remove the fish from the pan and allow to cool.
Heat the remaining oil in the pan and fry the chorizo for a few minutes until sizzling and crispy. Remove with a slotted spoon, turn down the heat and fry the garlic for 2 minutes. Take the pan off the heat, stir in the mustard and 4 tablespoons sherry vinegar. Season.
Slice the potatoes into a large bowl and add the chorizo. Flake the haddock away from its skin into the bowl and pour in the dressing from the pan.
Bring a large pan of water to simmering point and add a splash of vinegar. Crack in the eggs and poach for 31⁄2 minutes. Meanwhile, mix the watercress into the salad and divide between 4 plates.
To serve, remove the poached eggs from the water with a slotted spoon, drain on kitchen paper and then put one egg on top of each serving of salad.