i know this is illegal but the cost depend on what type of business you have, by this i mean, if i have a lad out with me 2 days a week cash in hand work on the same van as me, then the main costs are his wages, but if you are like dave morris vans and lads then u have lots like 28 days holiday, insurance, employers and van, extra equipment, ni contributions Uniform , waterproofs, extra equipment repairs, mobile phone, extra water production, sat nav