Collection and assimilation of UK company Data

I require all companies in a sector to be listed and categorized along with contact details such as postal address and email address. This means looking things up on Google and websites and URLs that I give you. What I need out of the data: Company Name, Company URL, Description, email, address, listed [ticker symbol], human resources email, human resources name, mail email, post code, region of the UK. I imagine there are about 1000 companies I would expect the list to be clean, clear and free of errors. The data is to be input into an excel spreadsheet. Some of the companies will be gained quite easily as these are already in existing databases.