Hillver mounts here, Dave:
http://gunshop-eb.com/Hillvermounts.php
I've not used that shop myself, so caveat emptor, but I do have a pair of these:
Mine are old ones, in steel, and look exactly the same as pictured... mine came boxed as "Tasco World Class" mounts, but they're stamped "HILLVER" underneath.
The black ones from that shop look cheap @ £15.