I can't comment on replacements but I would get the Leylandii out as soon as possible. They grow quickly and block light and will have to be "topped" anyway fairly often. My neighbour had to remove hers as they just got bigger and bigger. It was expensive but her garden has been transformed for the better.
This is due to lack of maintenance. They're not a plant-and-forget solution so I agree - if you're not responsible then don't plant them!
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