2004 Megane II 1.5dci - intermittent clutch start

new to the forum so bear with me...!



the car will start using the button and pressing the brake pedal. it will intermittently start using the clutch and start button..



any ideas on how to fix this? on googling it looks like it could the clutch sensor, but i have no idea on where to find this?



thanks in advance :))