Presumably, Funimation has UK rights for the second season but hasn’t done anything with that yet, so Anime Limited is going to have to author the first season release fresh.
It’s been a long process for The Melancholy of Haruhi Suzumiya to make its way out to UK fans on Blu-ray as Anime Limited picked up the first season back in 2015.
They’ve had delays since then as they were waiting on what Funimation was doing with the North American release because of various rights issues.