Modern biobanks typically rely on the public to freely donate genetic data, undergo physical measurements and tests, allow access to medical records and give other personal information by questionnaire or interview. Given the demands on participants it is not surprising that there has been extensive public consultation even before biobanks in the UK and elsewhere began to recruit. This paper considers the different ways in which biobanks have attempted to engage and appeal to their publics and the reaction of potential and actual donors. Whilst those organising biobanks presumably want to be as close to their publics as they need to be in order to successfully recruit and sustain participation in sufficient numbers, the closer the relationship the more obligations and expectations there are on both sides.