The Twinning Charter between Hailsham and Gournay-en-Bray was originally signed in Hailsham in October 2000 and in Gournay-en-Bray in February 2001, but officially renewed in October 2010 and February 2011 respectively.
Whilst the population of the two towns differs considerably (Hailsham c.20,500; Gournay-en-Bray c.5,000), the features and facilities of both towns are quite similar. Cultural and host family visits in both directions take place each year.