British actress Helena Bonham-CARTER finds it tough working alongside her director/husband Tim Burton - because she can't stop offering him filmmaking advice. The couple are working on a big screen adaptation of Sweeney Todd together and the star admits it's a trying time. She's even drawn up a list of commandments to ensure their relationship survives through filming. She says, "In Sweeney, there have been times when we've taken our 'couple life' to the set. And often, I should keep shtoom. I think my mouth just opens and I spontaneously say things that occur to me. "And that can irritate him, and I don't appreciate it that much. I've written down certain commandments now that I know I've got to adopt. One of them is that I should generally obey, and he should have a bit more patience. I'd say we're doing pretty well... this week."