Hawarden has the Beluga and maybe some HS125s, but it also has the very large A380 building only a few hundred yards from the runway, which does cause turbulence / wind shear / rotor if the wind is from the wrong direction.
I don't think it has been measured, with smoke tests, but it certainly gives a light aircraft a good shake up on some approaches. The flying schools don't like flying if the wind is 12 kts or more.