isnt it funny that whenever you check for a BA or VS price, they always seem to be within a couple of quid of each other?
i think you will find that orlando is very busy this year. $2 to the £ and demand is high. have just come back and the place was heaving, queues/lines for everything.
if you are in belfast, have you thought of lingus who are starting an MCO service soon?. if you are going in the school half term, its normally cheaper to go with a US carrier, albeit via one of the hubs.