Yesterday+1 is only 5am-7am at the moment looking through the EPG. This is same hours as the vacant stream that NOW 70s occupies on the same multiplex. Probably a coincidence as there is space for it to have a full stream on this multiplex. It could be Y+1 is just a placeholder for now, it's only showing Teleshopping during those hours so it's not a useful addition currently.
http://www.xhxf.uk/timeshares/