Current Rover clubs covering ownership of Rover 75 (and other earlier models in some cases...)
Stag>75 and Ian Shearman has already listed:
Rover Owners Club Inc. NSW & ACT &
Rover Car Club of Australia (Victoria & Tasmania)
adding in:
Rover Car Club of South Australia
http://www.rovercarclubsa.org.au
Western Australian Rover Owners Club
https://westernaustralianroverownersclub.wordpress.com
Rover Car Club of Queensland
http://www.roverqueensland.asn.au/index.html
Rover P4 Drivers Guild of Australia
https://roverp4guildaustralia.wordpress.com
Association of Rover Car Clubs of New Zealand
http://www.rovercars.co.nz
Facebook Page for NSW/ACT Club -
https://www.facebook.com/ROCNSWACT
Facebook Page for 75/ZT discussion out of Victoria/Tasmania
https://www.facebook.com/groups/195898917410810