1. Dear Rojash, I have nothing but respect for you and I am sure I must have thanked you when you did offer me kind comments. There was no element of 'sulking' in my response above, but - when someone says he does not "see much merit" in my case - I do feel bound to reply.
2. I guess that Times sub-editors, of all people, are familiar with The Times Guide to English Style and Usage, which is highly-regarded throughout journalism and beyond, so there can't be that much wrong with the headline.
3. The same applies when people speak of 'correct' or 'acceptable' English...and my God don't we see enough of that on AnswerBank! We none of us have the slightest notion of the context in which the questioner plans to use the phrase concerned and - as far as correctness in language is concerned - context and register are everything.
4. Putting my points in Paras 2 and 3 above - headline and acceptability - together, I still maintain that the singular noun 'head' is perfectly OK. I have no objection whatsoever to your disagreeing with that!
Cheers