Allow post id to be anything apart from '/'
Allow post id to be anything apart from '/'

DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextrepresentative,mysociety/yournextrepresentative,mysociety/yournextmp-popit,neavouli/yournextrepresentative,mysociety/yournextrepresentative,mysociety/yournextmp-popit,neavouli/yournextrepresentative,DemocracyClub/yournextrepresentative,neavouli/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextrepresentative,neavouli/yournextrepresentative