Where and how can I buy a DVD or a blue ray for a telefilm I don’t know the title ?

Hi all. It was either 2007, 2008 or 2009 when I watched this telefilm on National tv channel most likely ITV . I can’t remember the title , I only remember the story . It’s been really long but I loved the story and I want to watch it again . The drama set in UK. The story is about a young married women who fell in love with a handsome young man ( I think he was Irish). They were planning to elope . But the handsome man got killed by his own wife ( which the lover wasn’t aware of ). The song “ a certain smile , a certain face “ kept on playing repeatedly throughout . It was a one episode drama.