Big Ben, one of London's most famous landmarks, is developing a tilt, surveyors have found.<br /><br />Experts say that the movement, which is now visible to the human eye, was probably caused by underground excavations made since Big Ben was built in 1859.<br /><br />Members of parliament are discussing how to get the landmark back on the straight and narrow.<br /><br />Al Jazeera's Simon McGregor-Wood reports from London.
