By Jon Robinson Earnings at the production company behind TV hits such as Downton Abbey dipped in 2023 after the income it generates from its back catalogue fell, it has been revealed. Carnival Films has reported a turnover of £43m for its latest financial year, according to newly-filed accounts with Companies House. The figure comes after the business posted a turnover of £50.3m in 2022. The results also show that its pre-tax profit dipped from £9.9m to £7.3m over the same period. The London-based company has also made the likes of The Hollow Crown, Hotel Babylon, Agatha Christie’s Poirot and…