State whether the collection is in Marseille or another part of Provence, and give the complete address. A regional label does not tell us where the vehicle should meet you or which road leg comes first. For a private home, hotel or other stay, mention any agreed access point and the time you expect to be ready with your pet and luggage.
If the journey starts after a separate arrival or appointment, share that sequence and a contact method so the collection can be discussed around the actual plan. Include the final UK destination, passenger count, pet details and any crate or carrier. A route review can then account for the full itinerary without promising a fixed duration or a guaranteed crossing slot.
Nice-to-London is another South of France route; Lyon-to-London covers a different inland French collection.