11 SEPTEMBER 1964, Page 13

OPINION POLLS

Sta,—In the Spectator of September 4, David Watt refers to two criticisms of our methods; the way in which we adjust for people who are on holiday, and the fact that we do not interview everyone in the sample drawn from the electoral registers.

These and other questions have been dealt with at some length in the national press, notably in Mr. Hyett's letter to the Guardian on August 31 and in The Times on September 4.

Mr. Watt writes that 'these arguments have some substance.' I think that those of your readers who have read the letters will feel that, in fact, they have very little substance.

FRANK TEFR

General Manager National Opinion Polls Limited, Tullis House. Tallis Street, EC4