Fully understand both comments and your points of view.
I intentionally put down on the log engine start time,flew the detail and engine stop time and tacho end time,total time was approx 40 mins,this was total time the engine ran and total time for use of the plane..
Log was filled in with times as stated previously and I made a point of saying stop to start times,this was altered in front of me and ten minutes added,I have mentioned it before and the answer was that what we charge.
At £164 per hour inc landing fee its £23.33 more and if it was a twin (and it was explained when I flew the twin + 15 mins) it can be £100 or more extra !
Just peeves the life out of me when somebody tries to charge over the odds.