Having been Miss England in 2009, and now being a mother I personally feel that the two roles cannot coincide. Until you actually carry out the role of Miss England, you cannot possibly appreciated how much time is spent on the road, travelling from one place, or even country to another - it's all well and good saying but it's your choice etc but it would not be fair on a child.
What about the less overt misogyny of a culture which judges women on their body first, their face second, their hair third, and their intellect last? It's time we stop justifying pageant contents in the context of them being a way to reach our higher goals. Male medical students wouldn't pose in a swimsuit as a way to achieve great things, so why should female ones.