...what else? well david had figured that even if the gardeners' team were to realise that they had planted a device in the telephone booth and that garden display next to it...that they would still get their victim...a woman gardener 'on the team'....because they had programmed her to buy something to eat or drink - in matt's carousel...i am not sure which...but a small carton of juice-with-a-straw...was the first image to come to mind....which they had laced beforehand with polonium or something like that...mercury?...a poison of sorts....anyway, the obvious advice to the whole team is 'don't buy anything there until it has been checked out'...go figure.