Control circuit for a vapor provision system

A method of controlling a component in a vapor provision system, comprising:

• controlling the component using a first controller;
• monitoring operation of the first controller using a second controller for the purpose of detecting faults in the operation of the first controller via a communication link between the first controller and the second controller;
• and
• in response to detection by the second controller of a fault in the operation of the first controller, transferring control of the component to the second controller, wherein a master switch is accessible to both controllers, such that the second controller is further configured to, in response to detecting said fault, cut power supply to the component using the master switch.

An electronic vapor provision system or part therefore comprising:

• an electrical heating element;
• a battery;
• a first microcontroller with capability to control delivery of electrical power to the heating element from the battery;
• a second microcontroller with capability to control delivery of electrical power to the heating element from the battery;
• and
• a communications path between the first microcontroller and the second microcontroller;
• wherein one or both microcontrollers is configured to use the communications path to detect a fault in the capability of the other microcontroller to control the delivery of electrical power to the heating element from the battery, and in response to detecting a fault, assume control of the delivery of electrical power to the heating element from the battery, wherein a master switch is accessible to both microcontrollers, such that one or both microcontrollers is further configured to, in response to detecting said fault, cut power supply using the master switch.