"British Accent" phone greeting woman voice

I need a polished, “old-school” British English voice recording for our main phone line. The piece is short—just the initial greeting—and it must sound formal and professional rather than chatty. All I require in the script is our company name followed by a concise welcome message; no menus or next-step instructions. Once the wording is agreed, please deliver a broadcast-quality audio file (WAV or 320 kbps MP3). A clear, neutral background, well-balanced levels, and natural pacing are essential so the file can drop straight into our PBX without further editing. If you can provide two subtle tone variations, even better; I’ll choose the one that fits best. Let me know your turnaround time and any studio specs I should be aware of, and I’ll supply the exact line to record as soon as we start.