CO0005 is a NON-STOP flight from the south terminal to HOUSTON that departs at 12:00. THIS IS NOT VIRGIN ATLANTIC

In order to get to Orlando you then have to get another flight from Houston

The Easyjet flight arrives at 10:50 then, knowing Easyjet, you'll then spend a long time gettting from the aircraft to the arrival area by which time checkin will be closed for your CO flight.

Rebook (or even book a totally new flight if it's cheaper) for the previous day & look at it as a day trip to London. As you don't have to be at Gatwick until 10:00 you could easily spend the night in London.

BTW there are several airlines - including charter flights - that do direct flights to Orlando from Gatwick, why didn't you pick one of them?