Hi and Welcome to the forum, you might want to have a look at the following FAQ which explain where everything is
Welcome to Benefits and Work All benefits are now subject to periodic reviews, nothing is now 'for life'. I am assuming this UC is due to illness? The criteria are the same as for ESA, so have a good look at our ESA guides so that you fully understand the criteria.
May I suggest that you bookmark/favourite this on your web browser now so that you can find it easily in future? This will allow you to return with further questions or comments about your UC without having to start a new topic each time. We ask members to keep everything relating to the same claim in one topic as it helps us enormously - and I hope you will find it useful too