Vauxhall Corsa timing chain and tensioner

if your chain is rattling believe me get it changed what happens is the chain stretches, once stretched it dont stop stretching till the chain starts hitting everywhere making it sound like a diesel and eats it way through your water pump causing major damage for the sake of 2hrs work and 90 quid kit id be doing it. Otherwise head stripped ,new valves could be piston damage then of the road for a week. I would have changed it at 100.000, thats what i change my chains at on my Mitsubishi Delica, or do what the handbook says. Ive not seen the tensioner in a corsa, but on mine it resets itself wht the chain is renewed.
HTH.

ok thats grand thanks.it doesent seem to be rattling at all was just courous to see if it needs to be done. i wouldnt be 2 sure how 2 replace the chain is it a big job to do?? i have an owners manual on my car but it doesent mention anything about replacing the timing chain.