A bit of an advance warning to set the recorder...the first series of Merlin will be repeated on BBC3 beginning 21 August with the first two episodes:
20:30–21:15 The Dragon's Call Merlin arrives in Camelot but finds magic outlawed, its practice punishable by death. (R)
21:15 –22:00 Valiant Knight Valiant competes at Camelot's annual sword tournament. Merlin believes he's a cheat (R)
Read more about Merlin and his friends (and foes) at the BBC website.