This is sort of inflection-free acting [playing Maigret], and I really wasn't sure if I could do it - you make your mind up on whether I've succeeded or not. But yes, I found it difficult when we were shooting; it was a couple of weeks before I settled into not worrying - to finding a way of delivering those lines - so my worries of many months before I think had been justified. I found it a difficult way of being.