Hello from another taller than average household, (I'm the shortest at 5'11") . Our men shop at 2tall.com, not the cheapest but good quality and most importantly FIT.
@Adey1981, argghgh don't cut the duvet covers up, your missus might find a new use for the scissors . Seriously though, you can pick old duvet covers and curtains up for very little money in some of the charity shops. I am tall for a woman (6') and have similar problems getting trousers as long as I like to wear them so I know exactly where you're coming from.