Alton Towers' new roller-coaster, billed as the first of its kind in the world, will preview today, ahead of its opening on May 23.
'The Smiler' cost £18 million to build, has a drop of 30 metres and a maximum speed of 52 miles per hour.
The ride is the world's first 14 looping roller-coaster.
More top news
Early fog patches will be slow to clear, but then a bright morning with sunny spells.
Fog may be slow to clear on Sunday morning, but once it does there will be sunny spells.
Mist and fog overnight, slow to clear on Sunday.