How about the http://www.overclockers.co.uk/showproduct.php?prodid=KB-035-ST&groupid=702&catid=23&subcat=
EDIT: He said wouldn't mind buying second hand
Logitech G400
(Successor to MX518)
http://www.overclockers.co.uk/showproduct.php?prodid=KB-200-LG&groupid=702&catid=23&subcat=1257
