Competing arguments yes, but this is a very busy corner for traffic going around London using LAM (which is on the airfield for those that don't know). A call might alert sombody doing the same thing as you.
Sorry chaps I cannot understand why you would not call, and as for selecting the frequency, this could be one button push.
Maybe some of you are not familiar with this area. It's very busy with lots of controlled airspace and I would certainly use the radio as much as necessary to let appropriate stations know my intentions.