code: def get_broadcast_date(pid):
      
      print("Extracting first broadcast date...")
      broadcast_etree = open_listing_page(pid + '/broadcasts.inc')
      original_broadcast_date, = broadcast_etree.xpath(
          '(//div[@class="grid__inner"]//div'
          '[@class="broadcast-event__time beta"]/@title)[1]')
      return original_broadcast_date
docs: Take BBC pid (string); extract and return broadcast date as string.