i don't know if anyone is still following this but thought i would update and hopefully tap into your expertise 
we tried the podcast and i was so hopeful, it sounded like it would create such a peaceful night time routine. on the first night ds came down after 20 minutes saying 'hed had enough of the story now'
. next night he lasted 5 minutes before the same.
anyway last night bedtime got really delayed because i wanted to instal a bed guard on dd's bed to help keep her in bed (there are still gaps either side but at the moment i'm playing being a human bed guard just to keep things a little calmer, and at 28w pregnant that's getting a bit tricky!). it didn't fit after all that but that's another story they got so tired and took less than 20 minutes to conk out with no messing about.
which left me wondering whether pulling bedtime earlier is not the solution, maybe they just aren't tired, and a later bedtime (8.30) is ok. tonight we tried that and it worked again in that we had no messing about, although they took about 40 minutes to sleep.
do some kids just need less sleep? i tried googling that question, and the majority response was 'no'. but maybe i just have odd kids
i'll keep this up for a few more days and see how it goes anyway.
oh, i also bought a gro clock, but that's to stop the getting into my very squashed bed during the night. ds did seem fascinated with it as he was lying in bed though. so of course it could be that and not the later bedtime, i'll have to just see how the next few days go.
don't know if anyone is out there, but its therapeutic getting it all down, and thank you all for your help so far!!