49 jelly sweets made for 1.5 syns. Would quite happily use 2 sachets and make it 3 syns per batch as they would set a lot firmer.
1 sachet of jelly crystals - 1.5 syns (I use the hartleys ones and these are blackcurrant)
Make it up with the hot water as it says on the packet, let it cool and then stir a muller light (or any other syn free yoghurt) through the mix and then pour into your moulds to set. As simple as that. I chose the vanilla yoghurt with the chocolate bits to keep it relatively simple in flavours but you could use any.