The hardliners want to fully leave the EU.
In practice that means to sever all formal EU ties, in particular,
Independence.
They want out of the EU i.e. Customs Union, Political Union, Freedom of movement, Legal System.
Control of Borders.
They want to be rid of "excessive immigration" (and competition) which has driven and is driving down wages (vis-a-vis productivity) and strains resources.
Unfortunately for Brexiteers full execution of item 2. is not on the cards. Even in the event of a hard Brexit the rights of EU citizens in the UK have already been guaranteed.
https://assets.publishing.service.g...ts_Policy_Factsheet_A5_FINAL_WEB_260617_2.pdf