i just searched my preferred route of tpa to lhr in business and found 1 award for 115k miles in the next few days and a ton of options for no more than 10k over that mark for a business class ticket that would cost a minimum of 9k$ in cash, on american metal so no crazy cash copays. keep in mind it's the high season for london travel.
my point? trying to paint a broad picture with one, or even a few data points is a project in futility.