https://www.citizensadvice.org.uk/cymraeg/mewnfudo/deportation-and-living-in-the-uk-illegally/Eich-opsiynau-os-ydych-chi-yn-y-DU-yn-anghyfreithiol/
Eich opsiynau os ydych chi yn y DU yn anghyfreithiol - Cyngor ar Bopeth
How to get British citizenship or a legal immigration status if you're living in the UK illegally