@Yorky - it is worth searching for mango pickle rather than chutney if you want something with less or no sugar. Here is one I found which looks to me to be good. No sugar at all!
http://www.instructables.com/id/How-to-Make-Mango-Pickle-the-South-Indian-Way/
http://www.instructables.com/id/How-to-Make-Mango-Pickle-the-South-Indian-Way/