Hi Laura,
As you know that the "Wee Mummy" thing is just a diversion for you leaving him, how about you sit with him at a good time and write a list of all the things we need to do before bed. Then make it like a game at bed time, keeping it light and maybe putting a star against everything on the list as you go along, with lots of praise, this will distract him from his anxiety and give him a sense of achievement, as he is so independent. Then try some positive re-enforcement using whatever he covets as a a reward, stickers, coins etc. You could get him to decorate a special jar, and each time he goes to sleep like a big boy, in the morning he gets his coin or whatever in his jar, with lots of praise
. We're doing this again with Sam at the moment. Then maybe try saying, "Mammy is going next door to do x,y,z then I will be back to check on you. DH and I did this with Sam, it's really walk in walk out but with extra talking, and Sam would be much calmer, and often he would drop off after I had checked on him one time, ultimately we wouldn't need to do it anymore.
What do you think
x.