The port hopes the additional services will help it clear queues of traffic by midday on Sunday.
Pupils and teachers are said to be "shell-shocked" as they face "horrendous" delays at Dover.
Two of the men were arrested on 11 January, a humanitarian organisation has confirmed.
Police were called after "suspicious" behaviour near the residence of the Scottish first minister.
Battersea Cats and Dogs Home receives more than £100,000 after the presenter's death.
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