Thank you everyone. This has been very helpful.
Having grown up in Wales in the 70s and 80s, I played elastics just about every day, and now I want to teach it to my students in Melbourne, Australia. I remember the England, Ireland..chant, and a chant of 'Supercalifrajilisticexpialidocious', and agree with most people's interpretation of the moves.
However, I know there was a round where the 'posts' (the girls holding the elastics) had the elastic round one ankle only, and then sort of twisted the long part around their legs again, making one long tight elastic to work with. This was called 'twisties' I think. When you got to this stage, there was a new way of jumping to the chant, involving picking up the elastic with your toes and sort of separating it. Can't quite remember, and it's infuriating!
Also would appreciate help with the order...I think it's:
1. ankles (shoulder width)
2. shins (shoulder width)
3. kneesies (shoulder width)
4. thighsies (shoulder width)
1 - 4 repeated ('skinnies' - feet together)
1 - 4 repeated ('onesies' - one foot only)
1 - 4 repeated ('twisties' - one foot, and twisted elastics)
1 - 4 repeated ('splitsies' - feet very wide apart)

Finally, I kind of remember 'triangles' too. Vaguely.
Thanks everyone for your help.