Play Safety Forum:
https://playsafetyforum.wordpress.com/
Play England:
http://www.playengland.org.uk/
Play Wales:
http://www.playwales.org.uk/eng/
Play Scotland:
http://www.playwales.org.uk/eng/
PlayBoard N. Ireland:
http://www.playboard.org/
International School Grounds Alliance (ISGA):
http://www.internationalschoolgrounds.org/