Car wont start, just a clicking noise from the engine, insurtument clocks go all the way round before resting back at zero

Either flat battery or a bad connection from battery to starter, / starter, or bad ground to engine from chassis or battery, a jammed starter can also cause that

If you are getting a rapid clicking noise, that means the battery is dead or you have a poor connection between the battery and starter. It could also be a poor connection on the negative or ground side of the battery or ground cable. Try jump starting it or put a battery charger on it for a half hour or so and try it again. If you get it going you should have the charging system and battery checked ASAP (as soon as posible). If you don't need to go anywhere leave the charger on the battery over night, set the charger on a slow charge rate less than 15 amps.