I don't think it should be allowed. I first thought she might be part of the management team for the polling station as I didn't see her badge identifying her as a member of the Tory party. I realised that it would be unlikely that they would ask your polling number outside the building. I asked why she wanted to know. She replied that it was so we didn't get phoned later. I said that I thought that voting was meant to be confidential, after which she ignored me!