Letting Agent's fee near S21

Letting agents fees in S21 vary depending on the services and rent. 
The average rent per month in S21 is £824. So a tenant finders fee for 60% of rent is £495. 
In S21 a full managment fee for a property is between 10% and 20% of the monthly rental value, averaging between £50 and £99.
Renewal fees in S21 are charged for renewing a tenancy agreement between the landlord and the tenant, ranging between £25 to £74.