Unfortunately, in the UK letting agents (agents that act as middleman between a landlord and a tenant) have for many years been charging fees to the tenant when the contract is commenced and sometimes at renewal and at the end. These fees range from GBP100 to the more usual GBP200 and in some agencies GBP500. They also charge a fee to the landlord.
The cost of checking a tenant with a credit checking agency is usually GBP25 or less (it can be as low as GBP10) so the agents make a lot of profit.
The UK government allows this fee, despite many complaints.
Polish residential real estate agents are a useless bunch of effing retards.
You really do have an unfortunate way of communicating your points. Are you about 15 years old?