Research local estate agents and populate into a pre-defined excel sheet

I require someone to compile a comprehensive list of all estate agents based in the following post codes:
SA5, SA6, SA10 and SA11 (these are areas within South Wales).

I will provide the excel template and have already populated some lines to demonstrate how to populate the sheet.

I am only interested in estate agents that are based in these areas and not ones that purely serve the area.

You will use your initiative to utilise various websites to identify the estate agents (such as Rightmove, google, yell.com etc).

Alongside details of the companies, you will review available information to find key contacts, their roles and contact details.