Largest parade of convertibles

According to Official Guinness Records,

The largest parade of convertibles is 270 cars and was organised by the MX-5 Owner's Club (UK) at the Blyton Park Driving Centre, Lincolnshire, UK, on 1 July 2012.

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

Other United Kingdom records that might interest you:

• Fastest crossing of the English Channel by kiteboard
• Longest cricket marathon
• Longest videogame marathon on a card game
• Longest videogame marathon on Solitaire Blitz
• Most people wearing paper crowns in 24 hours (multiple venues)
• Fastest horse racing time over 5 furlongs
• Largest composite photograph exhibition