Karl, don't be daft, you would get £6.50 or there abouts for stacking shelves and a driving instructor gets around £20 an hour, which apparently, is more than many tradesmen !
There always were and probably always will be, people who seem to work, just for works sake. They're a pain, but have to be endured.
If they're on your doorstep, your only problem would be if they did a good job at low prices, but even then, you can widen your work area, or specialise ( quick drying / allergy treatment / protection / FREE spot remover ) or whatever.
The £20 per hour is probably just notional anyway, with much of his work taking double and treble that rate.