In accordance to our Terms, "It is strictly prohibited to submit a quote and/or invoice for only expenses (i.e. travel). All jobs must be paid for the labor involved."
All payment for jobs on our site must be above £50, and must be paid for the labor involved in doing the job, not simply for the costs/expenses for doing the job.
We state this rule as it is another way in which we exclusively promote paid work on the platform.