I've just received the following email from FC:
Here's a great opportunity to get away sooner with your miles.
With Miles Booster you can buy extra Flying Club miles on the flights you’ve booked and reach your travel goals sooner. It’s quick and easy, and you can choose whether you want single or double helpings of any boosts you make.
For example, when you make a return trip from London to New York, you fly 6,916 miles. With Miles Booster, you can get the same amount of miles again by paying just £69.16. Want to get your hands on double the miles? Simple, for £138.32, you can get an extra 13,832 miles.
But that's not all. Boost before midnight 9 March, and you'll also receive an extra 30% bonus on top of your boost. So be quick, and your miles could be taking you a lot further, a lot sooner.
By racking up your miles, you can get closer to great rewards with Virgin Atlantic and our partners.
Two weeks to get a 30% bonus on any boosted miles. Looks like I'll be boosting my Seattle trip booked for May.