I might be wrong but I think most wild hazel nuts are actually filberts which are a lot smaller than the Spanish hazel nut . If you do find a decent size nut see how many you can get off the same plant . Come Nov pop them in a big plant pot an inch and a half deep ( 5 x the biggest dia of the seed ) & cover it with some mesh to keep the squirrels out & water well . Put them in a shaded position that gets a bit of wintersun . By May you should start to see the new nut tree's emerging .
Pot grow them to about a foot tall give them a few BabyBio feeds in spring & late (ish ) summer , then plant them out in the early November when the leaves have fallen .
Planting them through a hole cut in a couple of sheets of thick weighted down cardboard helps keep the weeds at bay & stops them drying out till they are strong enough rooted to crack on by themselves .