I'm no fan of Michael Gove but I think he's getting too much of a bashing- apparently he left his son in a hotel room for 6 hours one evening with takeaway, access to soft drinks at the bar etc. The porters knew he was there.
Personally I think leaving a mature secondary child alone is quite unremarkable. Let's face it, it's different from when they were three or whatever.
I was from a stable, affectionate family and was left at home for a few hours the odd time from the age of 7 (IRRC). I stayed home alone for a few days aged 14 (my parents had accidentally booked a surprise holiday for the same date as my music exam).
I think our society infantilizes older children far too much, and this is just the press making a mountain out of a molehill.