Vauxhall Meriva after running the car wont start the day after just a clicking noise but will start with charger

need to know if it is alternater or starter motor

If after charging it starts that rules out the starter motor ,your looking at a charging issue ,I would think ,so alternator ,battery ,fuse ,or cabling ,requires checking .

Charging battery for five mins does no good other than getting you started . You need to get battery load tested which will check for weak / dud cells . Then if o.k , charge overnight . If that doesn't fix it , you could have a " lazy " starter that drags the battery down .

thank you for your help in replying to my problem will go ahead and try what you recommended

worth testing battery and terminals first also charge rate under load , engine to body earth lead worth a check, they used to use a braided strap between gear box and body gave trouble on older cars.