Some of the guys from BRS might have a more accurate answer, but Im based at LPL, and the runway there is not exactly long. EZY SOP is to go with FLEX take off whenever possible and therefore I would suspect that in the vast majority of cases this would be the case.
Even with quite a load, the FLEX temp can be used, albeit sometimes quite a low assumed temp.
The "tough book" gives a range of flex temps, but we generally go with the highest available given all the limiting factors.
Unless you flew on a Monday morning when you may have got on a flight where the crew had set TOGA to satisfy maintenance.
Cheers