I fly worldwide for a UK charter operator. In common with most UK comments so far, we have a plog which calculates the minimum fuel required using the most accurate weights, winds etc available, and then the F/O & I decide how much fuel we want to carry. There is no input from dispatchers or similar. There is no pressure from management to carry minimum fuel, or inquisition when we carry extra, but we have had aircrew notices asking us to consider carrying less extra fuel without reason, with an explanation of the financial penalties of unnecessary extra fuel.
We also have plog suggestions about tankering fuel when economically worthwhile, but again no inquisition/pressure. In 20 years with this company I have never been asked about how much fuel I have/have not carried.