The maximum group size varies depending on the tour. Please check the tour description for specific details. The taxi can fit up to 6 people, but due to the layout of the London Black Cab, especially with large amounts of luggage and wheelchairs this may be less. If you need a tour for more than 6 people, you will need to discuss with us. You would not necessarily pay the same rate for extra taxis, but extra costs are needed to pay for the extra guides.