Data cleansing

We are looking for someone to gathering all the information from all the companies on the attached link into a spreadsheet. Details needed are, Company name, Address, Telephone number, Managing Directors Name, Sales Directors name and email addresses.

http://www.ribacpd.com/companies.aspx

Please could you provide me with a proposal regarding the cost for completion and the potential margin of error that the data could contain when you send it back to us.