AIMS: Presents the results of an NOP Omnibus survey of adults aged 16 years and over in Great Britain. METHODS: The survey involved interviews with 2017 individuals, and took place between the 12th and 17th July, 2001. Interviews were carried out in-home, face-to-face, using Computer Assisted Personal Interviewing (CAPI). Respondents were selected according to a random location method. Quotas were set in terms of age and sex and within working status. The survey focused on participation and expenditure in the various National Lottery games. FINDINGS: 73% of household report having played, at some time, in the Saturday National Lottery draw, 52% every week. Participation in the Wednesday draw was considerably lower than in the Saturday draw – 52% had participated at some time and 28% of households on a weekly basis. Over half (54%) of the sample had personally scratched National Lottery Instants in the last seven days. The majority of these did not know how many they had scratched. Mean expenditure, among participating households, in the most recent Saturday draw, was £3.90. Mean expenditure in the most recent Wednesday draw, among participating households, was lower than that of the Saturday draw (£2.20). Expenditure in the Saturday draw was highest among households whose respondents were aged between 25 and 34 (£4.90), and lowest among the 55 to 64 age group (£2.80). Average expenditure was broadly consistent across income groups.