It can be argued that a TP Run, in the strictest sense, is a journey made for no purpose other than to earn tier points, in which case squeezing every last point out of the trip is sensible. The frequent "how can I earn xxx TPs by next week" requests fall into this category.

However, the majority of discussions and requests in this thread tend to be about optimising leisure or business trips that will be made anyway, and compromises are frequently made between tier points earned and comfort or convenience. As long as the itinerary comes in at under £3 per tier point, it qualifies as a TP run for the purposes of this thread.