Virtual Assistant

I am looking for a virtual assistant to help me with various tasks such as: - Answering the phone to take a message when I'm not available. - Be confident to call clients on my behalf and follow up with emails where necessary. - Be confident issuing invoices via Xero and chasing non-payment up where necessary without needing to be reminded. - Weekly activity reports. - Ad-hoc admin work such as internet research. Why I need a virtual assistant? I run Loaidesign.com and Plutio.com and very recently joined Paddle.com full-time. I barely have any time to answer calls and sometimes to reply to emails for days. I need someone who is: 1) Located in the United Kingdom, preferably London. 2) Good availability and always able to communicate.