London Letting Agents Data Scraping

Please compile a clean Excel list of 500–1,000 London letting agencies, concentrating on independents with 1–5 branches and mid-size firms with up to 20 branches. I need full city coverage rather than limiting the search to specific boroughs or postcodes... (Budget: £10 - £20 GBP, Jobs: Data Collection, Data Entry, Data Management, Data Mining, Data Processing, Data Scraping, Excel, Web Scraping)