Website URL: http://www.brittany-ferries.co.uk/faq/travel-information/can-i-transport-gas-cylinders

Can I transport gas cylinders?

When travelling in a vehicle, a maximum of three 15kg gas cylinders may be carried for the purposes of lighting, heating and cooking only. All cylinders should be adequately secured against the movement of the ship, away from sources of heat and ignition and must be shut off during the crossing.

For any other type of gas, including medical oxygen, please contact us for confirmation and permission well in advance of travel. For further information, please see here.