Most participants at a Summer Paralympic Games

According to Official Guinness Records,

A record 4,200 athletes from 166 countries took part in the London 2012 Paralympic Games, competing in 503 medal events in 20 different sports.

For a complete list of 2012 records, please visit 2012 Guinness Records in United Kingdom.

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Other United Kingdom records that might interest you:

• Highest bicycle 180°bunny hop
• Longest platform-to-platform bicycle jump
• Longest marathon playing wheelchair basketball
• Largest bottle of scotch / whisky / whiskey
• Fastest relay 4 x 100 metres (female)
• Most individual goals scored in a Water Polo Olympic tournament (female)
• Greatest distance run by a relay team
• Most Olympic tennis doubles titles won
• Fastest swim long course 200 metres backstroke (female)
• Largest collection of magazines