I wanted to book a dream holiday of my family of four to Florida through Virgin Holidays & Cruises a few months ago. I picked and mixed the "14 day Disney B&B package" and the "7 day cruise package" together with both of them already including return flight tickets from London to Florida.
When I asked for the quote, the price was way too expensive, and it seemed like they included the flight prices twice as if I booked them separately.
The staff at the Virgin call centre weren't too friendly either when I asked for a breakdown of the total price. Virgin Holidays & Cruises staff were too reluctant to explain how the price was fixed and refused to breakdown the price item by item.
FURTHERMORE at the time of booking, the Disney B&B offer came with free "$100 spending money and free a dining plan", but when joint with the cruises package, these free $100 spending money and free dining plan offer were gone. When I asked why, the Virgin staff rudely said because we booked the cruise together so we could not have these two offers together. It seems quite laughable to me that I will be punished by buying more packages from Virgin Holidays & Cruises.
So I do NOT recommend joining two separate packages together.