It could cause a lot of nailbiting and stress (for you anyway) but you could do what we did and apply late once you know what the grades are. We didn't meant to, my son wants to compose and UEA closed their music department, he really wanted to go there as it was ranked 5th in the country and close-ish and he loves Norwich. So he couldn't find anywhere else he wanted to go to as much, despite us hauling him around Surrey and heaven knows where else, and he decided to become music Gap student for a year at a cathedral school. He was offerd four places as a gap student and they all pulled out at the last minute becauise the government changed the way Gaps can be paid (board, food and around £50 a week pocket money to work all hours) to having to be paid hourly. None of the schools could afford it.
So it was either pull pints or stack shelves for a year or go into clearing, and apply for finance. He stuck down any old uni as a choice for that, I found out later. But then he got his grades and they were lower than expected (for some obscure reason they expect musicians to be mathematicians and physicists, but although he is not slow, and is highly intelligent, he has a short-term memory problem which makes it harder for him to memorise anything) and was despondent for a couple of hours but started phoning around. We didn't know the clearing system at all so did it wrong, he phoned about a dozen unis and they all accepted him with his lower grades. We were astonished. Apparently if you get in fast they have a sort of 'lower grade number of students' percentage allowance, however we discovered at number 12 we should have only been phoning up one uni at a time and waiting to see if he got in before moving on to the next. So he phoned all the ones back straight away that he didn't want.
HOWEVER he turned down all the 'good' unis. He found exactly the course he wanted at an ex poly, DBH and he raced over there to see the head tutor and check it out and he accepted it there and then, they were wonderful and the place was full of other students going through clearing and having a look, I had no idea that unis did that. They spent hours with him going through all the paperwork and putting a couple of things right for him.
It might not be what everyone would choose to do but it worked out very well for us. His grades were actually pretty good, but a couple of his friends got in to the same place with very low grades, far lower than advertised. My son could have chosen to go to some very well-known unis with far lower grades than they were advertising for.