As previously stated its voiced by Norman Lovett who played Holly, the ship's computer, in Red Dwarf and yes I've got Leo as my Covas.
Why?
IMHO its the best Covas currently available until we (hopefully) get more of the HCS Voice Packs converted to Covas packs. I'm hoping we get the Paul Darrow, Tom Baker, John De Lancie, Brian Blessed or some of the other packs.
In an ideal world Frontier/HCS would entice Stephen Moore out of retirement to voice a pack and before anyone asks who - Stephen Moore was the original voice of Marvin the Paranoid Android from the HHGG radio series and subsequent records and tv series.