They advertise good rates of pay, on the basis you do a stupid number of deliveries per hour to top up the basic rate.
Wifey does pizza delivery, i'll have a nose at who she's insured with. Went through the confused.com site, listed the occupation as delivery driver (takeaway stuff) added the business millage (i remember her policy document included wording along the lines of "use in connection with the employers business") to the price and it came back with a good price, about 60 quid more than her previous price.
I recently found an old wage slip from when i did pizza delivery just over 6 years ago, an amazing £4/hr