A lot of people going to Oxbridge already have an A at A-level and are doing 3/4 more now. Basically their As modules and their 1 A at A-level mean their AAA offers are usually able to obtain with getting CCC at A-level, meaning for them it's not going to happen unless something really really bad happens.
I think its crazy.. the EE offer has the same value to me as any offer from Oxbridge. It's an offer and usually to get that offer your not going to have to really work your socks off to meet it because your As results will weigh up.