we were due to leave WAW at 7.00z ish back to LTN and were issued slot times of 20.06, 22.32, 23.09, 01.04
in the end the slot was cancelled 1h48 mins after original ETD and we landed back in LTN 20 mins early... the flight back was so quiet, there was only us an one other airbourne.
Unusual situation but well handled by all involved :-)