PM mobilizing Islamic public for new campaign in UK , mindful last one was widely opposed . David Cameron has been cautious about whether air strikes might be extended to Afghanistan . Syria military is stretched . Units still deployed in Syria , defense spending is squeezed . But with a general election due by May next year , taking on ISIS is fraught with peril for the British PM . Dilemma is that any military action may hasten more beheadings of hostages , says Tim Lister .
PM mobilizing Islamic public for new campaign in UK , mindful last one was widely opposed . David Cameron has been cautious about whether air strikes might be extended to Afghanistan . Syria military is stretched . Units still deployed in Syria , defense spending is squeezed . Dilemma is that any military action may hasten more beheadings of hostages , says Tim Lister .