If you warm up any milk and than add a tablespoon of plain yoghurt to it, wrap it up in blankets and keep warm overnight - you will make yoghurt, no need to buy starters. the lakeland yoghurt maker is a pot that keeps milk warm, so you can just put your milk in, drop some yoghurt in and then wait. It tends to come out similar to the one you used, so if you like Onken you can get one almost like it (well, using milk with less fat will make it more sour than the creamy full fat versions). Good luck.
I raised the question of syns in my group once , but quickly realised that the consultant had no idea yoghurt was made from proper milk, so she kept saying to me I needed to use it as my hea. Crazy, because if I bought it like that I would be free. so I left my yoghurt maker in the cupboard and can't even tell if they do a 0% milk?