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I'm trying to rip the UK disc but I've got 4 titles to choose from:

Title information
Name: Star Wars: The Phantom Menace (English)
Source file name: 00800.mpls
Duration: 2:16:11
Chapters count: 50
Size: 53.4 GB
Segment count: 18
Segment map: 55,83,56,84,57,85,58,86,59,87,61,88,62,89,63,90,74,91
File name: Star Wars- The Phantom Menace_t00.mkv

Title information
Name: Star Wars: The Phantom Menace (English)
Source file name: 00801.mpls
Duration: 2:16:11
Chapters count: 50
Size: 53.4 GB
Segment count: 18
Segment map: 92,83,75,84,76,85,77,86,78,87,79,88,80,89,81,90,82,91
File name: Star Wars- The Phantom Menace_t01.mkv

Title information
Name: Star Wars: The Phantom Menace (English)
Source file name: 00802.mpls
Duration: 2:16:11
Chapters count: 50
Size: 53.4 GB
Segment count: 18
Segment map: 93,83,75,84,76,85,77,86,78,87,79,88,80,89,81,90,82,91
File name: Star Wars- The Phantom Menace_t02.mkv

Title information
Name: Star Wars: The Phantom Menace (English)
Source file name: 00803.mpls
Duration: 2:16:11
Chapters count: 50
Size: 53.4 GB
Segment count: 18
Segment map: 94,83,75,84,76,85,77,86,78,87,79,88,80,89,81,90,82,91
File name: Star Wars- The Phantom Menace_t03.mkv

Does anyone know which the correct one is??

It depends what you're looking for. Please see my post in the linked thread below, the same situation applies here: viewtopic.php?f=12&t=31920

Usually 800 is in English and the others have intros (text) in other languages. If English is desired use 800. Try the others for other languages.