18th-century manners, 21st-century instruments - the best of both worlds or a clear conflict of purpose? One would hardly expect a period specialist of Sir John Eliot Gardiner’s calibre and London’s most dynamic orchestra, the LSO, to be citing irreconcilable differences – and last night they didn’t. Their accounts of Beethoven’s first and last symphonies were, to say the least, explosive. But they were a good deal more, too, and the Ninth Symphony might well have startled, certainly thrilled, even Beethoven.