Preheat the oven to 180°C/fan160°C/gas 4. Put the fish into a large pan and just cover with water. Simmer for 5 minutes, until just cooked. Drain and flake the fish, discarding any skin or bones. Put the flaked fish into a small, buttered ovenproof dish.
Make 2 holes or wells in the flaked fish and break an egg into each. Spoon the double cream over the fish and around the eggs. Season well and sprinkle with the breadcrumbs. Bake for 15 minutes until bubbling and golden.