Many reasons Peter.
I'd make all taxes a fixed rate of 20%, income, VAT, CGT, IHT, corporation, we'd save a fortune in evasion and red tape. Subject to your £10k of course
IHT has always been a missed trick for me, tax all inheritance at 20%, its unearned income. When you bequeath me £100k (

) I'll be very happy to send Mr Osborne £20k of it.