Maybe the person you have part of your company is not specialized in web design in Liverpool, and he is more about other things. Not all people in the IT field do the same things; therefore, getting someone else to give you another idea does not harm. Things can always be better, and someone from the outside may come with something new, see things that maybe you did not, and that cannot work anywhere else than on your behalf. The more you need someone to help you if you do not know this area.