If you’re from U.K., you can consider Newmont Travel as my ‘mother-in-law’ uses:

Or Opodo that one of my few friends there used recently:

If you’re from the U.S., I recommend Apple Vacations and here’s a link direct to British Virgin vacations with them:

If from Canada, I recommend RedTag and a few others such as FareStore, Target Vacations and FlightNetwork:

Hope this helps.