I don't understand why the tax system is so complicated to be honest. VAT, corporation tax, insurance premium tax, inheritance tax, capital gains tax, income tax, CIS, import tax, etc etc should all be scrapped.
The replacement would be a simple amout, say 12 pence in every pound spent on everything. So it doesn't matter if you're paying staff, contractors through CIS, paying a plasterer, buying your shopping, or paying a tradesman to work on your home/business, 12% goes to HMRC. No exceptions, no exemptions, everyone pays the same.
Fair, simple, easy to administrate, very difficult to dodge.