Anna - try putting the booster on the outside of the BBHs, between the nappy and cover. Less stuff in the nappy, less leg gape. At least, that's what someone here suggested, and it worked for us for a bit.

CM - hun, most of the time I'm just channelling Gigi, Nelle, FJ, Arimeh or one of the other wise women of MCN in here that taught me everything I know! Congrats on the wedding dress, that must be soooo exciting!