Fuel delivery system

A fuel delivery system for a vehicle, the fuel delivery system comprising:

• a fuel storage vessel having a liquid fuel zone configured to hold liquid cryogenic fuel and a gaseous fuel zone configured to hold gaseous cryogenic fuel;
• a fuel line configured to transport gaseous cryogenic fuel from the gaseous fuel zone for delivery to a fuel consuming device of the vehicle;
• and
• a heat transfer circuit comprising heat transfer fluid and an uptake heat exchange element configured to transfer heat from a heat extraction point of the vehicle to the heat transfer fluid, the heat transfer circuit further including:
• a primary heat transfer circuit comprising a primary conduit within which the heat transfer fluid is able to flow, and a warming heat exchange element configured to transfer heat from the heat transfer fluid to the fuel line;
• a secondary heat transfer circuit comprising a secondary conduit within which the heat transfer fluid is able to flow, wherein at least a portion of the secondary conduit is located within the liquid fuel zone and is configured to transfer heat from the heat transfer fluid to the liquid fuel zone;
• and
• a selector device operable to switch the fuel delivery system between a warming configuration in which the heat transfer fluid flows within the primary heat transfer circuit but not the secondary heat transfer circuit, and a vaporising configuration in which the heat transfer fluid flows within the secondary heat transfer circuit.