Declaration of support:

I have read and understand the party constitution and agree with it.
I am registered to vote at my current address and will vote for a Divergent Party candidate should one be available in my area.
In filling this in, I acknowledge membership of this political party and will do my best to promote it any way I can.

All this information is given under the GDPR basis of consent.
You have the right to withdraw this at any point. 
It will be used to keep you up to date and remains confidential.
Other party appointed personnel will also have appropriate access.