Yes. I have done it before, walked out a full time job into a part time £633 a month job and lived a bare minimum life style and it was fantastic. I just hate work.
I can't do it now that I am older but I don't need much motivation to quit and live on handouts where possible. It's people like me who would love socialism, UBI and the likes just so I don't have to deal with work anymore.
Nothing stopping you doing that now, UBI wont change that at all.
The main advnatge of UBI is it stop the benefits trap. Currently, you can sit on your backside and get by on JSA/housing benefits/kid benefits. These benefits disappear/reduce when you start earning, preventing the workshy form wanting to enter work. a UBI is additive to any earned income, to the motivation to go and and work at least a part time job increases a lot.