It is wrong
You'll find the same hypocrites up and down the land, moaning about eastern Europeans taking their jobs
The same fudgewits are paid cash in hand, but will not think twice about using the hospitals, NHS dentists and other public services
The majority of people paid cash in hand are extremely unlikely to be net contributors to this country
Therefore, they have about as much right to be here, as the millions that Labour encouraged to flood the Island in order to win votes
Most tradesman cannot be trusted to declare earnings
So I would simply make it illegal to pay somebody unless they provide you with a VAT receipt and invoice