Does participant awareness of study focus and assessment of drinking influence subsequent alcohol consumption?

Behavioural: All participants will be randomised to one of three web-based surveys (Groups A, B or C). All participants will answer the same questions on lifestyle behviours including socialisation, fast food intake, drinking and physical activity. Group A will be told they are completing a Lifestyle Survey while Group B will be told the focus of the survey is alcohol intake. Group C will also be told the focus of the survey is alcohol intake but they will answer a series of extra questions about the impact of alcohol on their behaviour and lifestyle before answering the same lifestyle questions as Group A and B. All surveys will take less than 10 minutes to complete. All participants will be asked to complete a second, follow-up survey 4 weeks later and this will take less than 5 minnutes to complete.