If you are planning on travelling to Heathrow Airport from around the Paddington area your most direct route will be on the Heathrow Express. The journey takes around 15 minutes each way and there is a very frequent service of 4 trains per hour at peak times. The Heathrow Express is much more convenient than the London Underground which can take up to 1 hour.
The offer started earlier in the year and appears to be running indefinitely. Star Alliance Gold Members are the select few who are able to get a free upgrade to business class on Heathrow Express. If you travel with an airline in this alliance and have the equivalent gold status you will qualify for upgraded travel. You do not need to register for this offer, just show your Star Alliance Gold on the train.
Making use of this offer is very simple. Customers just need to purchase a standard class single or return ticket for the Heathrow Express, the fastest rail link between the airport and London Paddington Station. Once on the train, customers can choose any available seat in Business First Class and show both their train ticket and Star Alliance Gold Card to the attendant.