Forensic Audio Cleanup & Transcript

I have a ten-minute MP3/WAV in which two people are speaking from behind a couple of walls. At present I can make out the voices, but most words remain muffled and indistinct. What I need is a full, time-stamped... (Budget: £20 - £250 GBP, Jobs: Audio Editing, Audio Engineering, Audio Mastering, Audio Production, Audio Services, Digital Signal Processing, English (US) Translator, Sound Design, Speech Recognition, Transcription)