Your booking reference number will be a 6-digit code made up of both numbers and letters. Where to find it depends on the type of ticket you have:
Flights booked on this website
If you booked your flights on this website we will have sent you a booking confirmation email. Your booking reference is near the top under 'Booking Details'.
Virgin Atlantic e-tickets
Your booking reference is close to the top just above the Issue Date.
Paper tickets
Your booking reference can be found in the PNR Code field usually located in the centre of the ticket. You just need the first six digits you don't need the '/' or the two digits after it.
Virgin Holidays
If you have purchased directly from Virgin Holidays, the reference is a five or six digit number, followed by a '/' and a three digit alphanumeric combination, e.g. 12345/S05 or 654321/W05. This can be found at the top of your holiday invoice.