Thanks for the replies guys.
@bt93: It is true that the Brompton is expensive, but think long term, and it is actually cheap. A bike that will still be a joy to ride in 6 to 10 years for £600 to £700 is not bad at all. In fact it is very good value for money.
@jur: I hope you are right ! I'm not very fit at the moment.
Do you know if Vehicular Cycling is allowed in the UK ? I'm a bit worried, cause I sometime see car drivers swearing at cyclists on the road :/
@Azreal911: Most days, I'm at University for only a couple of hours, it is only one day a week where we have 6 hours of studying, and even then, the whole IT Branch of Studies is one building, so I'm good in that regard. But your point is a good one to mention. Thanks.