1967 16 162 This scheme [for conducting polls] differs slightly..from that used in practice by N.O.P.
a1974 R. Crossman (1975) I. 571 There is no doubt Harold is going through a terrible time, though the N.O.P. poll published on Thursday showed us with a 16½ per cent lead.
1999 4 May i. 4/7 Men can get post-natal depression, an NOP poll for Bella magazine has found.