ITV News understands that the man arrested in connection with the 15 people found in a lorry in Somerset is the driver.
ITV News producer Sandi Sidhu has tweeted:
Man arrested by Avon and Somerset police is the driver of the lorry, police say he is from Germany.
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Passengers, including a pregnant woman, say they have been stranded since 4pm yesterday.
The boxer said it was the "least he could do" and even donated the £30,000 shorts he wore in his last fight against Devon Alexander.
By Sunday it should become drier with spells of winter sunshine but temperatures will still remain on the cool side.