SMILE!!! Why do you think that route duplication is a good thing as it achieves nothing to help develop a route structure from Cardiff. It temporarily widens the market as a result of price but means that one or both operators will eventually drop the route.
Bristol have been very careful in achieving a good selection of routes and dislike any kind of head to head competition but CWL management seem intent on sticking the knife into any airline operating out of there.
This may help explain why they are slowly becoming a turbo prop "International" airport.