From Religion or belief: a guide to the law by Equality and Human Rights Equality Commission -
'The Act does not include a definition of belief other than ‘belief means any religious or philosophical belief’ and includes a lack of a particular belief. The courts have developed a definition of belief through the cases they have decided.
A belief need not include faith or worship of a god or gods, but it must affect how a
person lives their life or perceives the world.
For a philosophical belief to be protected under the Act it must:
• be genuinely held
• be a belief and not just an opinion or viewpoint based on the present state of
information available
• be about a weighty and substantial aspect of human life and behaviour
• attain a certain level of cogency, seriousness, cohesion and importance, and
• be worthy of respect in a democratic society, not incompatible with human dignity and not in conflict with fundamental rights of others. For example, Holocaust denial, or the belief in racial superiority are not protected.
Beliefs such as humanism, pacifism, vegetarianism and the belief in man-made climate change are all protected.
Wasn't this bit 'be worthy of respect in a democratic society' not specifically stated in the Forstater case?