Yes I have some Ribena lollies in the freezer, and they are 1 syn (the long ones shaped like mini-milks). I also remember getting some supermarket own brand fruit ones that were 1 syn, again the same kind of shape as mini milks, might have been ASDA.
Has to be a twister for me though, mainly becasue I can take ages eating it - you have to eat the ice cream swirl off first!