This has long been the policy of the Green Party too (another illustration that Left Unity is hunting on the same territority as them and will have to drive them out to make any headway).Here's a couple of articles analysing this proposed reform showing why it wouldn't work as expected::
http://www.worldsocialism.org/spgb/socialist-standard/1980s/1988/no-1009-september-1988/green-partys-basic-income-scheme-could-it-work
http://www.worldsocialism.org/spgb/socialist-standard/2000s/2008/no-1243-march-2008/basic-income-dangerous-reform