Same as Fir trees, leylands are very shallow rooted and those look very top heavy. Awful damage.
When we moved here there was a row of leylands (4 trees, big and bushy) along the roadside. In the first gale they blew down onto the road. We removed 3 of them and kept the last, which we winched back into position. All these years later it has regrown its roots and survived many storms.
It's often said that leylands are of no use to wild birds, and I used to believe that. However, that one remaining tree is quite close outside my dining room window so I get to watch what goes on in it every day. It's the only place I've seen Gold Crests, it's always full of various tits foraging for spiders. Blackbirds, collared doves, thrush, chaffinch, robin, wood pigeon have all nested in there and their chicks have fledged. In the winter lots of birds roost there, also when it's windy. In years when they produce a huge crop of their tiny little cones, they are a beautiful red which glows in the sun.
So leylands have gone from being my least favourite tree after blackthorn, to being one of my favourites.
If only people would keep them under control so they stay below about 20 feet