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Mix the fajita seasoning with the flour and some salt and pepper in a bowl. Put the beaten eggs and the breadcrumbs in two separate bowls, then line all three bowls up.
Working in batches, coat the fish in the seasoned flour, then shake off any excess and dip in the egg, followed by the breadcrumbs. Place the coated fish fingers on a plate.
Pour enough oil into a large frying pan so that it covers the base. Heat the oil over a medium-high heat, then fry the fish fingers in batches until golden and cooked through (approx 3 mins). Drain on kitchen paper and season with sea salt. Transfer them to a low oven to keep warm.
Spread each roll with 1 tbsp of mayonnaise and a handful of lettuce, then build up your sarnies with the hot fish fingers, tomatoes and gherkins. Serve with lemon wedges for squeezing over and kitchen paper.