Jumbo puzzle

Read down the letters in the shaded squares to spell out a long-running TV series (6,7).

Across

9 Snow runner (3)

13 School subject (7)

14 Fix up (7)

15 Hospital worker (5)

16 Direction (4)

17 Guesthouse (5)

18 Bird of prey (5)

19 Rise and fall of seas (5)

21 Low area between hills (6)

22 Period of instruction (6)

24 Eg, Malta and Corsica (7)

28 Wireless (5)

30 Acceptable (12)

32 Continent (4)

34 Guaranteed (7)

35 Not either (7)

36 To the exterior of (7)

38 Corsair (6)

39 Moral rule guiding behaviour (9)

41 Cricket official (6)

44 Plant used in cigarettes (7)

45 Spouse (7)

47 Cookie (7)

48 Try out (4)

49 More and more (12)

51 Volume of maps (5)

54 Farming implements (7)

57 Models (6)

58 Stylus (6)

63 Respond (5)

64 Synthetic material (5)

65 Group of singers (5)

66 Conceal (4)

68 Light boat (5)

69 Come up from underwater (7)

70 Part of speech (7)

71 Stick (3)

Down

1 Spectator (8)

2 Relic (6)

3 Noisy quarrel (3)

4 Legends (5)

5 Use roughly or unkindly (8)

6 Spoken (4)

7 Below (10)

8 Shelf (5)

9 Threaded fasteners (6)

10 As an alternative (7)

11 Sold (6)

12 Perceive (5)

20 For the benefit of all (10)

23 Formal assembly (7)

25 Stage whisper (5)

26 Surprised (8)

27 Lowest floor of a building (8)

29 Portrays (9)

31 Tumult (4)

33 Of the soul (9)

34 Hunger (8)

35 Tube line (8)

37 Holiday property ownership schemes (10)

40 Picture mentally (7)

42 Threadbare (4)

43 Does as told (5)

46 Standing still (10)

50 Rode at full speed (8)

52 Talking (8)

53 Less close (7)

55 Gains knowledge (6)

56 Pursued (6)

59 Fire-breathing monster (6)

60 Lorry (5)

61 Category (5)

62 Crawled along the ground (5)

65 Talon (4)

67 Male offspring (3)