Instructions:Go to www.flyzoom.com (their homepage) and look for the orange tab "Enter Promotional Code"
Follow the instuctions to enter the code, then proceed to search and book your flight. The 15% discount is applied to booking towards the end of the process (when you have selected the specific flights)
You also get the 5% online discount.
"Employees, Family and Friends of HBOSplc can now book and save 15%"
No other conditions, or limitations. You're a friend of Howard Brown right?
Extract from their website:
Zoom operates low fare scheduled transatlantic flights linking Canada and the United States of America with major UK cities and between Canada and Paris, France.
We offer cheap fares to and from Toronto, Montreal, Ottawa, Halifax, Winnipeg, Calgary and Vancouver to Paris, London, Rome, Glasgow, Manchester, Cardiff and Belfast. We offer low cost flights from Gatwick to New York JFK, San Diego, Fort Lauderdale and Bermuda.