The new policy removes any requirement for trans or non-binary members to complete a declaration stating how they would like to be identified if applying for (or if they have an existing) Ride, Commute or Fan membership.
These membership packages do not include a Race Licence, and therefore the declaration is not necessary as the policy is clear that British Cycling encourages transgender and non-binary participants can take part in recreational/non-competitive activities in the gender they identify as.
Trans or non-binary members wishing to obtain Race memberships (either Gold, Silver or Bronze) will still be required to submit a signed declaration that their gender identity is different to their sex recorded at birth, however, the rule that this declaration cannot be changed for four years has been removed.
So no declaration required unless competing, and even if you're competing you're now allowed to switch back and forth as much as you like. 