AIB coming off a fixed rate mortgage

I'm currently on AIB "Discontinued" variable rate mortgage (2.75%) and I'm considering switching to a fix rate mortgage. The question I have is, once the fixed rate mortgage ends, will I return to the discontinued variable rate mortgage (of course at whatever rate it happens to be then) or will I end up on their new LTV variable mortgages which are more expensive? I've asked AIB, but they were very vague about it just saying that they would issue a letter with different options when the fixed period is up. Also any opinions on how long to fix for? In advance thanks for any help.

Not being smart brian but if AIB cannot be definite then you may struggle to get the answer you want here. There are loads of threads related to fixing a mortgage, try a search.