Preheat the oven to 180C/350F/Gas 4.
Place the grated cheeses, mustard and cream into a bowl and mix well. Season with salt and freshly ground black pepper and set aside.
Cut the cherry tomatoes in half and place into a clean bowl, season with a little salt and add the herbs. Mix the ingredients well so that the cherry tomatoes are well seasoned.
Spread half the cheese mixture into a gratin dish (or into individual ovenproof dishes).
Lay half of the fish on top. Then place all the tomatoes and herbs on top of the fish.
Place the second half of the fish on top of the tomatoes, followed by another layer of the cheese mixture on top of the fish.
Transfer the fish to the oven and cook for 20-30 minutes (or 15 minutes for single portions)
Until it has turned golden-brown and is cooked through.
To serve, place a portion of the fish on a clean plate and serve with a big green salad and some boiled new potatoes if you wish.
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