Follow instructions at http://www.gridpp.ac.uk/wiki/Instruction_for_VO_administrators

- d/l NEW.voms.gridpp.ac.uk.cert.pem and re-name 
  (voms.gridpp.ac.uk.cert.2008.pem).

"You can download it and place in /etc/grid-security/vomsdir with root as 
the owner and the attribute "644". 

Retrieved from 
"http://www.gridpp.ac.uk/wiki/Instruction_for_VO_administrators"

The rpm pack is now available at
https://www.gridpp.ac.uk/vo/voms.gridpp.ac.uk.hostcert.pem-1-2.noarch.rpm
