Campaigning is allowed on polling day, so you might see campaign material on social media or receive a leaflet through your door on polling day itself. But campaign material is not allowed within the perimeters of a polling station. This means there shouldn’t be any campaign posters, banners or other advertising literature present at the polling station.
However, there’s nothing to stop the house next door to the polling station from displaying campaign material in the window or putting a banner up in the garden. There may be some local planning restrictions that prevent placards or banners being put up nearby, but this would not be covered by electoral law.
Campaigners or candidates must not campaign near polling stations in a way that could be seen as aggressive or intimidating (for example, large groups of supporters carrying banners, or vehicles with loudspeakers or heavily branded with campaign material).