I had read this before and what struck me is the fact that he took this many in order to attend Oxbridge. I know that those two universities make offers to applicants based normally on 3 A-levels (normally an offer of AAA). They may think positively about a candidate taking 4, as I am planning on doing, but never would they require more. Clearly this was more than about getting into Oxford or Cambridge, as the information I have heard about him would make him a top candidate taking 3/4 A-levels. It makes a nice excuse to say it is because of the unis, but it doesn't stack up.
What I am concerned about as somebody starting A-levels next year is that this paves the way for 5+ A-levels to be taken by more people when it simply isn't necessary. If more start doing it then others will feel the need to follow them, which won't help students attain good grades.
To put this into context, I was discussing with teachers recently whether I should take 4 or 5 AS levels and was told that taking 5 would involve too much work and stop me having a life outside school. Shows how unnecessary 24 A-levels are.