Refuse a conditional offer by lying about IELTS results?

Hey there!

So this is my problem: I applied through UCAS to study English and Linguistics, next 24th July I will have to choose my firm and insurance choices, and I'd like to make Manchester Metropolitan (conditional: they ask for IELTS 6.5) my firm and Brighton (unconditional) my insurance.
The thing is I already completed one year course of University in a different country so, when applying to study in the UK, I asked these Unis whether they'd consider the possibility for me to get straight into 2nd year and they said I first needed to reply to my offers and then send them my transcript (that will be ready after 24th July!) in order to make a decision for me. But now I'm so confused! What if I meet the requirements of my conditional offer and then they say they won't accept my transfer into 2nd year, while Brighton would?
I thought that, in case Brighton accepts my transfer, I could lie to my Manchester about my IELTS results and say I didn't pass the test...unless they require evidence of it, and this way I would go back to my insurance choice!
Do you know if I need to forward my Ielts results though not having passed the text or I can just tell them that I failed meeting the requirements?


Thank you very much!

Basically I just want to know if asking my firm conditional choice to reject me would enable me to go to my insurance (which is unconditional).