Ok, here is the plan
Z refused her pm nap and woke up c after 20 mins, at 2:20. So I took them out in the pushchair and z had about an hour, ending at 4. C is beside herself so we are having early bedtime if 6:20 to try and get her to catch up on some sleep. Z will just have to cope!
Laura - back rubbing settles c but she now wakes up pretty much the second I stop. The reassuring hand is slower but she is more likely to stay asleep.
The plan for the night:
No feeds til 3:00 (they did it yesterday so I know they can)
Big girl dummies that glow in the dark

Settle C by hook or by crook and try and get her to sleep
Even more dummies in the cot!
When they wake at 5, feed and back down. No fun, no chat, no getting up!!!!
DH is doing long shifts and can't really help at the moment at night as he drives a lot for his job and it just gets dangerous! He is doing 5-7 so I sleep then, so it's not as awful as it could be!