Thanks for the links, aren't they the exception though? I can't see how 'the right' would be in favour of this. It is the antithesis of everything they believe in.
The idea is that it takes people off benefits and makes it easier for them to work. At the moment, if you earn x pounds and your benefit is y pounds then money is deducted from your benefits payment. This creates bureaucracy (ie more government spending) but often the person declines the work as there's no gain (for example, any additional money is eaten by transport to a job). A universal income means that it's a lot easier to earn extra money as your not losing any - and there's a big cut in public sector expenditure as lots of civil servant jobs disappear.
If someone has a full-time job then the additional money they earn can be spent in the economy, thus creating more jobs.
Cutting welfare benefit, cutting government bureaucracy and given people more cash in their pockets are all generally accepted conservative beliefs - which is why so many right wingers support the concept