Haven't read the article but this is about protecting young people from forced marriages. I started a thread about this a while ago which had quite a few responses as it isn't clear how raising the age to 18 would stop forced marriages.
Personally I think it is crazy that anyone as young as 16 is getting married and would hope that the stupid culture we live in that still pushes people to think this is something to aspire to, will eventually stop peddling the myth.
In the meantime if you have a better suggestion as to how to stop arranged / forced marriages I suggest you get in touch with the campaign and MPs who think this is the way to do it.