there are various outfits (Newmarket, Riviera etc) that arrange trips for newspaper readers. You can usually find them by clicking on the Reader Offers section of the media websties.
Unfortunately, they can be readers of any newspapers who buy into their services, so Telegraph-type retired colonels may be surprised to find Mirror oiks (or worse, Guardian yoghurt-knitters) in the next seat. Which sort of defeats the object of the exercise, I can't help feeling.