There is quite a big thread about the reasons why the LGW-MCO flight is quite often delayed
here. On the very first page on that thread Willd gives a good explanation as to a number of the reasons why delays do happen on this route. Also that thread explains and discusses some of the problems VS have regarding how busy the fleet is etc.
I am sure there is a specific reason why today's flight is delayed although for us to know that is very unlikely.
Neil