Gary Barlow, Chris Evans, James May and Brian Cox will drive through the Midlands today in a pink Rolls Royce raising money for Breast Cancer Care.
The challenge will see them driving from Land's End to John O'Groats in a bespoke pink Rolls Royce Ghost.
They want to try and raise £1 million in 24 hours.
The four celebrities will stop off in Birmingham as part of their trip to meet breast cancer sufferers from the Midlands.
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Any mist or fog will clear quickly during the morning leaving the rest of the day dry with plenty of hazy sunshine.
Saturday will be fine and dry with sunny spells but with a noticeable easterly breeze.
Former Aston Villa, Coventry City and Leicester City star Dion Dublin tells ITV News Central how he thinks his former teams are doing.