30 of the Guinness World Records Set at the 2017 London Marathon

Fastest marathon dressed as a swimmer
Set by: Joe Spraggins
Time: 2:42:24

Fastest marathon dressed as an elf, as a Viking
Set by: Ashley Payne (elf), Paul Richards (Viking)
Times: 2:58:26 (elf), 3:03:16 (Viking)

Fastest marathon dressed as a monk
Set by: Malcom Treby
Time: 3:03:31

Fastest marathon dressed as a crustacean
Set by: Simon Couchman
Time: 3:13:18

Fastest marathon in film character costume (female)
Set by: Rebecca Cesar de Sa
Time: 3:16:19

Fastest marathon in a full-body animal costume
Set by: Laurence Morgan
Time: 3:16:27

Fastest marathon dressed as a monk (female), as a bishop, as a nun (female)
Set by: Sarah Dudgeon (monk), Max Livingstone–Learmonth (bishop), Victoria Carter (nun)
Times: 3:21:33 (monk), 3:21:32 (bishop), 3:26:53 (nun)

Fastest marathon dressed as a Mr. Potato Head
Set by: Philip Powell
Time: 3:24:19

Fastest marathon dressed as a cartoon character (female)
Set by: Rebecca Vincent
Time: 3:24:28

Fastest marathon dressed as a witch (female)
Set by: Nicola Nuttall
Time: 3:26:13

Fastest marathon in a two-person costume
Set by: Alex Smith and Chris Stone
Time: 3:33:22

Fastest marathon in a sleeping bag
Set by: David Smith
Time: 3:44:01

Fastest marathon female dressed as a gingerbread girl, as a cheerleader (female)
Set by: Cat Dascendis (gingerbread), Julia Mitchelmore (cheerleader)
Times: 3:46:55 (both) 

Fastest marathon dressed in a full body dinosaur outfit (female)
Set by: Gemma Stevens
Time: 3:57:46

Fastest marathon dressed as a padlock
Set by: Kou Tseng
Time: 3:59:40

Fastest marathon dressed as a telephone box
Set by: Warren Edwicker
Time: 4:07:57

Fastest marathon dressed as a television character (female)
Set by: Alice Gerlach
Time: 4:13:39

Fastest marathon dressed as a star
Set by: Michael Law
Time: 4:20:07

Fastest marathon dressed as a dragon (female)
Set by: Jayne Moreton
Time: 4:32:54

Fastest marathon wearing chainmail (upper body)
Set by: Tom Langdown
Time: 4:50:16