Blind Persons Tax Allowance

I had a couple of queries about Blind Persons Allowance recently from existing clients and
also non-clients so thought I better find out about it.

Turns out claimants have to be registered blind (partially sighted will not do) with their
local authority under the National Assistance Act 1948. 
It is a pretty high threshold actually.

This tax years allowance for 2013/14 is £2,160.