 Volunteers will receive the vaccine candidates ChAdV63.HIVconsv C, MVA.HIVconsv M and pSG2.HIVconsv DNA D in a DDDCM regimen at weeks 0, 4, 8, 12 and 16. CPHPC or placebo is given by 26 hours infusion prior to the pSG2.HIVconsv vaccinations. 