RAT 5
A very good post about fuel planning and when I worked for XL airways the company worked hard to get the fuel flight plans adjusted for individual aircraft.
This gave the crews very reliable information that they could base the fuel uplift on. There was no fuel policy apart from trying to carry as little as you could for economy and as much as you needed for safety.
When the pilots became confident in the fuel planning system the result was that few people just added fuel "to be sure" it always became a properly considered decision on what was the appropriate fuel load for that flight.