The Guardian - The opportunity to build a European mega-cap firm is tempting, but itmp;#146;s hard to beat the appeal of share buy-backsThe stars never aligned for a grand merger of BP and Shell over the decades, despite the deal being touted regularly as inevitable at some point. How about now?BP has been torturing itself, its shareholders and the outside world with its on-off green transition plans and its ponderous strategic mp;#147;re-setsmp;#148;. Not even a hard kick from the activist boot