my cobby does sometimes small, sometimes massive bucks when asked to canter. if ur on a hack u can take forward seat so u dont get the whole power f the buck but otherwise experience teaches u to sit them out :) x
my cob was also bred in ireland. we got his microchip scanned and they managed to trace him way back right to when and where he was born :) if ur horse isnt micro chipped and if ur really desprate u could trace back through his owners starting from whoever u bought him from and see how far u get...