Your costs are $5 a call with the message emailed or Facebooked. Phoning them in to you will cost you phone charges from the UK. Also, you will have to pay for your dedicated cell phone with your dedicated British number for your UK office. You can get cell phone and service for £16.99 a month.
You have a choice of an American accent or an English one.
Let me and my colleagues make your business look good!