Hi, a professional web researcher, writer and data entry specialist here. I have carried out several research and data entry for my clients. I know where to get quality and up to date information regarding any niche on the web.
I just finished creating "internet based companies database in France, sweden, Australia etc" listing for one of my clients and I also entered in the information (with logos) at the back end of his website.
Although, your requirement is for people living in London, but the research is internet based and can be carried out on the internet. Now, I will like to give you a sample based on your requirement, it will be free and if you like it, you can award the job to me and if not, you have the liberty to give it to someone else. Let me know your thought.
Thanks for reading my bid,
Hephzy.