Market Research on packaging of a new brand

We are looking to launch a new imported brand of hard sweets. We have made changes to the packaging to suit the UK market. What we want is a quick feedback on our packaging design from target market boys and girls ages 10 - 25. So basically contacting the target market on streets showing them our design and asking for any changes they would ideally like to see. Is that something you are willing to do in London, perhaps Oxford street or some other busy street for a day or so? Let me know please - thanks