In a car on level ground I would not block change. I suspect that most of us old timers do it by ear - when it sounds right, change up. In some circumstances you need to push a bit harder, but that is at the expense of extra fuel consumption. If the boy racers leave you standing at the lights, console yourself with the thought of their fuel bills.
That's just it...it wasn't!:D It was a MINI driven by a young blonde woman.
Regarding the block changing and doing it by ear thing, my dad does that seemingly (doing it by ear). He takes the car (a Freelander 2) to the max rev and then changes up through the gears. The car seems to jerk forward when he does change gear.
Do you go by the revs when you listen out for the right moment? If so my car revs between 2500 and 3000 rpm (according to the print out of the test during it's MOT and service). I don't know if the revs have anything to do with it but I am guessing since the engine notes comes from the revs then the limit of the revs for your car is important to listening out for the right moment to change.
Thanks for all the help everyone.