Polyamorous couples and families do not have the same rights and protection as other couples or minorities in the UK and many other places in the world. Polyamorous people and families should be able to live their lives peacefully without discrimination, from both civil and authority personnel.
You may be interested in these active petitions
I would like parliment to consider polyamory to be a protected characteristic for the purposes of equality legislation, or for it to be legally possible for marriage to more than partner in the UK.