Preheat the oven to 180°C fan / 200°C / Gas mark 6
Pat salmon fillets dry with paper towel, then season with salt and pepper. Place onto baking tray and seal with tin foil. Place into oven for 15-20 minutes, until cooked through.
Meanwhile, melt the butter in a pan then stir in the garlic and cook for a minute. Add cherry tomatoes and season with salt & pepper. Cook until tomatoes are beginning to burst, then add spinach. Continue to cook until spinach is beginning to wilt.
Stir through the double cream, parmesan and herbs and bring to a simmer. Reduce heat to low and continue to simmer until the sauce is slightly reduced, around 6 minutes.
Plate the salmon and spoon over the sauce. Garnish with herbs and a squeeze of lemon. Serve with new potatoes or steamed seasonal vegetables.