what mileage you on ,I had my cam chain done at 82k ,didn't do the balance chain at the time .but when I got over 100k the balance chain started rattling so needing doing.the wifes astra coupe has 77k miles on the clock and the balnce chain started rattling so had to be done ,cam chain was done the year before
makes sense to do the balance chain if your doing cam chain as you need the cam chain off to do the balance chain ,so pm @[deleted] he will sort you out ,hes a dab hand at these chains ,some say he does them in his sleep lol