Richy
Why don't you spend your time on getting you business to work, forget all of these wild dreams to avoid tax and be a wheeler and dealer, you are not a Robert Maxwell, you will get caught and you will go to prison and lose the lot.
Remember its not hard for the tax man to do checks on you, a simple internet search, and this topic will be flagged, you might as well go the full hog and sign your comfession.
If you want to avoid vat, then do the following, only get commercial customers who are vat registred, stay below the vat threshold or go down the franshise route, but at some stage you will reach the limit and have to pay it.
Or the simple way, add 20% to your prices.