Re: Start tracking them young
" Probably a cheap way of identifying those with the skill set to wage a cyber war early on in life."
Well they might find a few, but if they're any good why would they want endure the drudgery of life as a civil servant?
I worked on defence computing as a civil servant (before we parted ways as mutually incompatible), and the civil service is enough to drive you mad, with its penchant for inaction, bureaucracy and sloth, coupled with a tolerance of incompetence and waste.
I suppose if these youngster join GCHQ then they might get the chance of an exciting secondment to MI6....on second thoughts maybe that's not such a good idea.