In Mr Justice Mostyn – An Appreciation on His Forthcoming Retirement [2023] FRJ 77 I referred more than once to his important decision in Hasan v Ul-Hasan, decd and another [2021] EWHC 1791 (Fam), [2022] Fam 1, [2022] 1 FLR 1033. I said that he had followed the proper approach, playing