He confirmed he has asked Labour's Ann Clwyd, MP for the Cynon Valley, to examine how NHS hospitals could deal with complaints better in future.
In December, she criticised the care given to her late husband at Cardiff's University Hospital of Wales.
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Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.
Over 70 firefighters are currently tackling the fire, which is now confirmed to be at a scrap yard.