It is a terrible idea - Singapore is a one party state and 30% of their workforce is immigrant labour, so unless you want Victorian work houses - it can't work in the UK. On top they have a highly educated workforce - and you know what the regulars on here think about education.
It's not all bad, Singapore has done very well for themselves. If only they weren't handed back to China
We're already halfway there, 14% of the UK population are immigrants...