If you are looking for houses in Chichester to rent it is advised that you hire an estate agent and use their expertise to look for houses. These estate agents can be hired through any estate agency. The advantage of hiring these agents is that they have prerequisite knowledge about all the properties and are in touch with the owners. They can help you get a discount or close the deal on the house without causing any issues.
The owner sometimes doesn't publically announce that the house is available for rent because they want some known contacts to rent the house. These owners then contact the agents and the agents help with finding some good tenants.
If you are looking for a house for sale in Chichester you should only hire estate agents in Chichester because agents from other cities might not have the amount of knowledge that the local agents might be having.