Two options really - either pd for first nap at normal clock time (accepting lie-in was probably a catch up) and see what happens. If you get a normal nap length, carry on with day as normal, if short, do what you'd normally do if LO short-naps. The alternative is to keep normal A time so nap at 11.15, hope for normal length nap then skip CN and do EBT, or do very short CN 15 mins and normal BT. What do you think?