I think there is quite a lot of history here. I rode around the boxhill area a lot in the early to mid 70s, not really a lot of cycleactivity then clubs or otherwise. There was however a big problem with motorcyclists illegal hill climbing and drag racing along the mad mile. Perhaps Surrey Police have these problems at the back of their minds ?
The motorcycles around there were always a bit of a problem. I lived not far from box hill about 12 years ago and trying to drive through there on a warm Sunday afternoon was always a bit frought with bikes wheelieing and racing up and down the road, not to mention the massive crowds of onlookers that gathered often in the road!
If the complaints from the locals genuinely are regarding inconsiderate riding and aggressive behaviour on the part of cyclists (and let's not pretend that that does not happen!) then I can see the problem. If it is just that drivers feel the volume of bikes is holding them up then that is not a reasonable complaint.
As a thought, I was riding in a sportive last year with a large group of riders. The line of us must have been easily 100 yards long. Going up a couple of climbs cars would move out to overtake and need to move back in before reaching the front of the row of bikes. I saw a few drivers getting abuse hurled at them by some of the cyclists which seemed unreasonable to me, letting them back in so they could wait for the next opportunity to pass the rest of the line would seem like a much more reasonable thing to do IMHO.