You can either commission a photographer for a period of time (hours,days or weeks) or buy rights to use photographs that already exist.
Whatever you need, please call to discuss your requirements. Photographers aren't here just to take the pictures, we can help with your marketing plans and make sure you end up with useful photographs.
If you'd like more information about Copyright, Licensing etc, here are some useful links
www.copyright4clients.com/
www.beyond-the-lens.com/
www.londonfreelance.org/feesguide/photo.html