You are contradicting yourself. "the average taxpayer would pay £15k extra in taxes if they receive £15k in BI" vs "Another way of looking at it is that aver

You are contradicting yourself. "the average taxpayer would pay £15k extra in taxes if they receive £15k in BI" vs "Another way of looking at it is that average taxpayer with UBI has an income of between £35k and £45k". Today a taxpayer with median income £21k takes home £19k net. After your reform, he will take home the same £19k net (remember: pay £15k extra in taxes if they receive £15k in BI). Except hew will now be way below the median and making only £4k more than the now ubiquitous dude Lebowski type.