L-mail, or Letter Mail, allows individuals and businesses to send letters to any postal addresses from any computer with a web browser. L-Mail print and post letters from Europe, America and Australia for fast delivery.
You've got several options. There are direct buses to Gatwick Airport from Heathrow - go to Heathrow Airport's Central Bus Station (well-signposted).
Alternatively, you can go by train. Either take the fast (but expensive) Heathrow Express or the cheaper (but slow) Piccadilly Line to central London, then the Gatwick Express train from Victoria Station to Gatwick.
Taxis are expensive of course, but may be your best option if time is tight. The main highway between the two airports (M25) is famously congested most of the time, but your driver should know the best route for the time of day. I don't recommend car rental - too much hassle, especially if you don't know the way and are not familiar with UK driving habits.
