Someone please help me, urgent! - A Level validity & re-applying

I will keep it brief,

So I did 4 A Levels; Maths & Further Maths - Edexel
Accounting & Economics - CIE International A Level

I did my AS in June 2014 and A2 in June 2015.

I want to retake my Economics this November (International only) and I was only going to retake A2, but apparently I can't do that cos I can't carry forward my AS marks to get a full A Level (more than 13 months).

So I am retaking both AS and A2 Economics this November.

The question is, can I use the rest (Maths, Further Maths, Accounting) of my A Level results for 2016 UCAS application? Are they still valid? Some people say it depends on what unis I am applying to.

Yes of course you can. It's only if a uni specifies that all the A levels to be counted against an offer have to have been achieved at one sitting (this does sometimes happen) that your resit wouldn't count - they would rely instead on the grade you already have. A levels do not have limited validity

Thanks for replying!

Just another question though, let's say I get conditional offers before results day which will be some time in January. If I get the results required will my conditional offer change to unconditional?