Foster carers will almost certainly have heard of Lemn Sissay by now. In the last year, he has become the ‘face of fostering’ – a trite, but popular term, for myriad activities or endeavours human beings engage in if judged to be all-knowing on that topic. And as he has recently been getting a lot of media attention, it’s fortunate he has such an engaging and winning manner. Because that’s what’s needed when it comes to firing up the debate…