A method for detecting misfuelling of a vehicle, comprising: determining that the vehicle is to be fuelled; capturing an image of a fuel nozzle positioned in the vicinity of a filler cap of the vehicle using an on-vehicle image capture device; detecting at least one feature of the fuel nozzle indicative of the type of fuel dispensed by the fuel nozzle in the image; determining the type of fuel to be dispensed by the fuel nozzle from the at least one feature of the fuel nozzle detected in the image; determining if the type of fuel to be dispensed by the fuel nozzle is compatible with the vehicle, and if the type of fuel to be dispensed by the fuel nozzle is incompatible with the vehicle, causing a warning to be produced indicative of a misfuelling event, characterised in that the capturing of the image of the fuel nozzle positioned in the vicinity of the filler cap of the vehicle comprises: capturing a second image of two or more fuel nozzles (33, 37, 38) positioned in a fuel pump using an on-vehicle image capture device (7, 9) as the vehicle enters a petrol station; capturing a third image of the fuel pump using an on-vehicle image capture device (7, 9), and determining that one of the fuel nozzles (33, 37, 38) has been removed from the fuel pump from the third image by comparing the second image with the third image and in the event that the fuel nozzle has been removed both the second and the third image are analysed to determine the type of fuel of the fuel nozzle which has been removed from the fuel pump is to dispense and whether this type of fuel is compatible with the vehicle, and if the type of fuel is incompatible with the vehicle, causing a warning to be produced indicative of a misfuelling event. determining that the vehicle is to be fuelled; capturing an image of a fuel nozzle positioned in the vicinity of a filler cap of the vehicle using an on-vehicle image capture device; detecting at least one feature of the fuel nozzle indicative of the type of fuel dispensed by the fuel nozzle in the image; determining the type of fuel to be dispensed by the fuel nozzle from the at least one feature of the fuel nozzle detected in the image; determining if the type of fuel to be dispensed by the fuel nozzle is compatible with the vehicle, and if the type of fuel to be dispensed by the fuel nozzle is incompatible with the vehicle, causing a warning to be produced indicative of a misfuelling event, characterised in that the capturing of the image of the fuel nozzle positioned in the vicinity of the filler cap of the vehicle comprises: capturing a second image of two or more fuel nozzles (33, 37, 38) positioned in a fuel pump using an on-vehicle image capture device (7, 9) as the vehicle enters a petrol station; capturing a third image of the fuel pump using an on-vehicle image capture device (7, 9), and determining that one of the fuel nozzles (33, 37, 38) has been removed from the fuel pump from the third image by comparing the second image with the third image and in the event that the fuel nozzle has been removed both the second and the third image are analysed to determine the type of fuel of the fuel nozzle which has been removed from the fuel pump is to dispense and whether this type of fuel is compatible with the vehicle, and if the type of fuel is incompatible with the vehicle, causing a warning to be produced indicative of a misfuelling event. capturing a second image of two or more fuel nozzles (33, 37, 38) positioned in a fuel pump using an on-vehicle image capture device (7, 9) as the vehicle enters a petrol station; capturing a third image of the fuel pump using an on-vehicle image capture device (7, 9), and determining that one of the fuel nozzles (33, 37, 38) has been removed from the fuel pump from the third image by comparing the second image with the third image and in the event that the fuel nozzle has been removed both the second and the third image are analysed to determine the type of fuel of the fuel nozzle which has been removed from the fuel pump is to dispense and whether this type of fuel is compatible with the vehicle, and if the type of fuel is incompatible with the vehicle, causing a warning to be produced indicative of a misfuelling event.