Beware, my starter exploded! I came down stairs this morning to be confronted by a mess. My Kilner jar had shattered - too much gas! Fortunately I had another jar, which didn't shatter, so I still have a starter. I am going to resort to a small Pyrex bowl covered with cling film. Paul Hollywood suggested using these jars on his tv programme! Not a wise choice. Anybody else had this problem?