Comparision between the version which you can find on the BBFC 18 DVD by Platinum Media Corporation (Giallo Collection) and the uncut German DVD by Dragon.
This Dario Argento classic was cut in nearly every country it has been released, particularly in Germany.

For this comparison the German VHS has been used, which is almost identical to the BBFC 18 DVD (thanks goes to user Buster who varified that through a second comparison). Only a violent moment in the finale was cut additionally on the German VHS, this was left out for the following translation. Either way, because the German VHS has been used in the first place the runningtimes may be a little bit different.

Arrow Video's 2017 Blu-ray release contains both these versions and also the way shorter R-Rated cut called "Creepers".

German VHS = 105:04 minutes (identical* to BBFC 18 DVD)
German DVD = 111:05 minutes
Duration of cut footage= 5:48 minutes*

* An additional 13 second cut exclusive to the German VHS was left out in the translation and causes the additional difference in runningtimes.

00:0 The DVD sets in earlier (black screen only).
3.5 sec.

12:21 The shot of the headmistress Frau Bruckner (Daria Nicolodi), striking at the bee in the car, is slightly shorter.
1.5 sec.

14:24 One sees Jennifer (Jennifer Connelly) walking to her bed minimally longer.
0.5 sec.

18:01 Jennifer's roomate Sophie is shown longer, as well.
0.5 sec.

18:13 Before Jennifer replies, one sees her lying in bed longer.
2.5 sec.

18:16 Sophie is seen briefer on the VHS.
2.5 sec.

22:54 Before a part of the balcony collapses, a shot of Jennifer sleepwalking is missing.
3 sec.

0:23:01 The face of the murder victim is shown minimally longer.
< 1 sec.

24:20 The two young Swiss men help Jennifer on her feet and lead her to their car. She tries to get away, but they seat her in the vehicle and drive off.
14.5 sec.

24:33 Short scene of her struggling in the car.
1 sec.

24:39 She tries to wrest herself free some longer.
3 sec.

24:41 Dito.
3 sec.

26:24 The beginning of the shot of Professor John McGregor (Donald Pleasance) shining into Jennifer's eyes with the lamp is shorter.
1.5 sec.

28:07 The beginning of the shot in which she takes Inge the chimpanzee by the hand.
3.5 sec.

29:59 The start of a shot of Jennifer.
1 sec.

31:42 Dito.
1 sec.

31:50 She is shown longer again.
1 sec.

32:19 The beginning of the shot of the headmistress.
1 sec.

33:56 During the school scene, a tracking shot from Sophie to Jennifer in the callboxes is missing.
18 sec.

38:15 The news show logo on the TV is shown longer.
3 sec.

38:23 The news anchor can be seen longer, as well.
1.5 sec.

38:26 A part of the news program is missing.
1 sec.

38:30 Inspector Geiger is featured on TV longer. Furthermore, the beginning of the next shot of Sophie is missing. She walks a bit, looks back, turns around and goes on.
11 sec.

39:58 Sophie is shown longer. She takes a deep breath.
3 sec.

40:21 She looks around longer.
1 sec.

42:03 The end of a shot of Jennifer and the beginning of the next shot of Sophie fleeing are missing.
1 sec.

42:46 Jennifer can be seen longer.
2.5 sec.

43:03 She follows the firefly longer.
2.5 sec.

43:54 She approaches the bushes.
6.5 sec.

44:20 After she has grabbed the glove, she pulls it out of the bushes longer.
1.5 sec.

46:18 There is a film tear during a shot of McGregor.
2 sec.

46:52 Jennifer turns towards the professor.
3.5 sec.

54:37 The nurse puts her knitting things aside and closes her eyes. Intercut to Jennifer watching her from the edge of her eye.
12 sec.

54:45 The nurse is shown minimally longer. Afterwards, the beginning of the shot of Jennifer under the blanket is missing.
3 sec.

54:48 She is fumbling about with the needle in her arm.
1.5 sec.

54:57 Shot of Jennifer who is still trying to pull out the hypodermic needle.
3.5 sec.

62:16 An elderly lady on the bus asks Jennifer to shut the window. Jennifer refuses and gets grumpy. Annoyed by her behaviour, the woman makes for the front of the bus. Then comes a shot from the rear window of the bus. One can see Geiger's car following it.
20.5 sec.

63:48 Jennifer is shown on the meadow slightly longer.
5.5 sec.

66:01 She turns around before leaving the room.
3.5 sec.

66:34 Close shot of the paper rolls on the shelf.
1 sec.

66:49 Jennifer's attempt at getting hold of the rolls is shorter.
6.5 sec.

66:51 After she has put aside one of the rolls, she jumps up again to get hold of another one. Only then the chair collapses.
7.5 sec.

68:20 One can see the severed hand and the maggots on it some longer.
0.5 sec.

71:41 Beginning of the shot of the lance in the Professor's stomach. He rolls his eyes and breathes stertorously.
2 sec.

74:05 The ending and the beginning of a shot is missing in which one can see Inspector Geiger and a carer in front of a cell.
2.5 sec.

79:14 Jennifer and Frau Bruckner are shown longer.
1 sec.

81:33 Jennifer wipes the sweat off her face.
8 sec.

81:49 The scene in which the headmistress grabs Jennifer's arm and forces her to take the pills is longer. A little struggle ensues.
26 sec.
The VHS contains a shot of Jennifer's face which is not on the DVD.
+ 3 sec.

85:45 The shot of Jennifer running out of the bathroom is longer.
1 sec.

85:52 When Jennifer wants to use the phone, the headmistress hangs up and seizes her by the arm. It comes to a noisy fight, which ends with Jennifer breaking away from her. Frau Bruckner's head hits a cupboard and Jennifer continues her phone call. In the background, one can see the headmistress getting up again.
27 sec.

85:57 After the directress has knocked Jennifer out, she starts screaming hysterically.
7.5 sec.

86:35 Bruckner drags Jennifer across the floor and threatens to kill her in case she does not stay quiet.
13 sec.
The VHS features a cut of Geiger approaching the house. This is not contained on the DVD.
+1.5 sec.

91:49 Jennifer follows the telephone cable and removes her scarf due to the heat.
20 sec.

92:58 She swims in the mixture of carcasses and maggots and dives her head in for a moment.
1.5 sec.

93:10 Ending of a shot of Jennifer. She submerges in the sludge again.
1.5 sec.

93:32 Beginning of a shot of Frau Bruckner entering the torture chamber.
4.5 sec.

93:40 Jennifer's attempt to climb out of the basin is shorter.
5 sec.

93:48 There are two shots missing: Inspector Geiger trying to break loose of the chains and Jennifer swimming in the sludge.
2 sec.

94:14 After Geiger has grabbed the headmistress from behind, he drags her to the ground and strikes at her.
4.5 sec.

94:36 Shot of Geiger strangling the blood-drenched woman on the floor.
3 sec.

95:38 Jennifer stops and looks back briefly, before she runs on.
3 sec.

96:46 The shot of the boy being attacked by the flies on the boat is shorter.
1 sec.

97:23 Jennifer looks at the water surface slightly longer while she is sitting in the boat.
3 sec.

97:33 She looks at the sky longer.
2 sec.

97:39 One can see her longer as she is sitting in the boat and looking around.
13 sec.

98:18 Shot of the flames on the water surface and Jennifer diving beneath them.
1.5 sec.

98:31 She submerges again.
1.5 sec.

98:50 Underwater shot of the bloody face of the boy and him reaching for Jennifer's legs.
2 sec.

98:56 The close up shot of her face under water is longer.
1.5 sec.

100:26 After she has got out of the water, she glances around longer.
17 sec.

105:04 The closing credits resp. the song are longer.
7 sec.