By Zesha Saleem Drivers leaning into the festive spirit are warned over a viral TikTok car decoration trend that could land them with huge fines – or even invalidate their insurance. While decorating is an important part of the Christmas season, experts at Nationwide Vehicle Contracts have issued a warning it could lead to some troubles. In one viral video, with over 54K views, a girl decorates the spare tyre on the back of her Mercedes G-Wagon as a Christmas wreath by using tinsel and LED lights. One TikTok user commented on the video that she would “love love” to do this to her, while anothe…