if u retake the test again even if your previous score is within the period of validity(ie. within 2 years) does the former become invalid by virtue of the latter score?
I sat for ielts last week awaiting results now...and my previous exam was in june last year...so does it mean once my new score comes the other becomes invalid?

I haven't got a clue... and I don't think anyone here has... have you tried calling Cambridge and asking them about this?

My best-guess is that your latest IELTS doesn't make your previous one become invalid... but can't really say for sure...

Thanks a ton beicon,

actually the thing is I have got my CAS reference number from QMUL and they they have mentioned there documents by which the offer was given- they are my certificates from college and then my earlier IELTS (they have mentioned the score there.)
They have asked me to make sure the info is correct.
The thing is last week I again sat for IELTS to meet the requirement of securing a band score of 7 in all the subsets as is required by KCL.
So the question is if by chance i secure a higher/lower score do I get to inform QMUL about the latest IELTS result?

higher -> yes
lower -> no
of course?!?

yes they become invalid and the only one that is valid is the one obtain in the last exam you took

how long does the Test- Center hold records about the tests ?
In my country i think, i'm only able to send the results to universities within the next 5 or 6 month after the test.

I've asked in my center (in Russia) and they say me that both of your results remain valid!

ok, so you are able to decide, which test result they send to the universities ?

I'm worried that this might lead to some confusion in practice., when the center is not well organised...

I've checked the information on several websites one more time and it's definitely true that all of your results are valid within 2 years, no matter how many times you've passed the exam. And in practice you just state the date of the exam (the results of which you would like to submit) and your ID number on the Test Report Form and I don't think that there should be any mess with this.