These voice demos are all in MP3 format. The size is given next to the file name.
Arthur also has a dedicated website for his voiceover work which has more voice demos at arthurbvoice.com
British Airways advert (623Kb)
Siemens SL55 advert (263Kb)
The Alan Clarke Diaries trailer (179Kb)
Cathedral Cove, New Zealand (504Kb)
Extract from Eats, Shoots and Leaves (1.13Mb)