Seems likely that the Acklands and Cumberbatches would vacation together - they have been papped together a number of times and i seem to remember someone tweeted or told of a story one time about seeing Sophie and someone from the Ackland clan (can't remember if it was Adam or his wife) in a park together with their offspring.
I think his relationship with AAck is definitely one of those things that keeps BC "grounded" as he is quick to point out in interviews. They seem very close and they both have young families so that gives them that as a bonding experience.
What I want to know is - what does BC carry in that backpack? He seems to almost always have some type of haversack or backpack with him. Is it that he just can't be without a stack of various books, scripts, baby supplies, snacks, iPod, tablet, umbrella, CCC's favourite "binky", change of blue chambray shirt, etc.? Or is this like the Queen's purse - just a box of mints, some lip balm and pair of reading glasses? LOL!
"You're going into the water... short-arse!" - Sherlock