Voice artist required for IVR prompt recording

Native British English female voice talent with accent required for professional recording of approximately 460 short audio prompts for use in a telephone IVR application, comprising (approximately). Accent must sound professional and clearly understandable by all English speakers, but there is no strict preference. The attached PDF lists the prompts to be recorded. Prompts should be supplied as individual files based on a naming convention to be supplied and in WAV or MP3 format. If they can be converted to a specific VOX format within the price that would be a bonus, but is not mandatory. Please provide a sample recording of the following phrase with your bid: "Thank you for calling. All of our representatives are assisting other callers. Rather than wait on hold we can call you back when it's your time." The sample should be using your actual proposed voice artist and representative of the quality that you propose to provide - i.e. professional studio and editing.