Down and Roberts injuries mar Cardiff’s victory
The Wales skipper made his first return to action after his controversial red card, which saw him banned for three weeks, for a dangerous tackle on France’s Vincent Clerc in the World Cup semi-final in New Zealand.
The Blues had tries from prop Tau Filise and young wing Alex Cuthbert, to put them in pole position for qualification from a pool which also includes London Irish and Edinburgh. Scotland fly-half Dan Parks also kicked 16 points, including two conversions and four penalties.