By Jasmine Allday An Antiques Roadshow guest was left speechless at the value of a stone head she found in a drain. The BBC show travelled to Northern Ireland for its latest episode, where Adam Schoon gave his expert opinion on a large stone head. The guest explained she had found the item in a drain whilst digging it up and couldn’t believe what she had found. Speaking about how she came across the item, she shared: “I was digging up drains and I just so happened to dig down and hit stone, and I pulled him out and there he was. The more I cleaned him I thought, ‘No I am not sure.'” Adam gave …