Virtual assistant required!

My business is growing quickly! I need some help. We do guaranteed rent in North and West London under the name Fixedrent. its just me at the moment and I need the services of a virtual assistant on an ad-hoc basis, but over time this will develop more and more. Duties will be varied, but initially i will need someone to maintain websites, write letters and generally be available during daytime hours on the other end of the phone.
Ideally im looking for someone who is a virtual assistant full time and lives within an hour of NW London as I want to work with someone who it is possible to meet on occasion!