A video has been posted online showing the moment a luxury motor yacht was accidentally steered into the side of an historic bridge on the River Thames in London yesterday.<br /><br />The boat can be seen edging under Richmond Bridge in west London when a current appears to drag it off-course causing the starboard side to crunch heavily into the stonework.<br /><br />The boat, thought to be worth more than £1 million, was eventually steered under the bridge and carried on its journey down the river.