You can access the various calendars on your iPhone, iPad, Android phone, Google Calendar, Thunderbird/Sunbird or any other iCal-compatible calendaring system using the following URLs:

Seniors’ calendar:

http://www.google.com/calendar/ical/sphinx.org.uk_jt8bnthj3as483poehpp2g24gc%40group.calendar.google.com/public/basic.ics

Juniors’ calendar:

http://www.google.com/calendar/ical/sphinx.org.uk_l06sg23d36kbqamu3jfqb13dn0%40group.calendar.google.com/public/basic.ics

Meetings calendar:

http://www.google.com/calendar/ical/sphinx.org.uk_b6t5008f8lgpbeqa3omo7b8u2k%40group.calendar.google.com/public/basic.ics

Miscellaneous calendar (social events etc.):

http://www.google.com/calendar/ical/sphinx.org.uk_sr0ce64hflk0pl3t48ngbkml44%40group.calendar.google.com/public/basic.ics