Deirdre- He won't go in his cot for day sleeps either - he doesn't sleep very deeply during the day and only naps for 30 minutes at a time. I put a shirt of mine in there with him but it still didn't help.
Sacha - Yes he plays in his cot with no problems he loves playing in there
Boomba - Glad someone else is going through the same thing! Its going to take a while I think. DS is bf to sleep aswell its the only way he'll go to sleep. Last night I let him lay with me on the bed for an hour after he went to sleep to make sure he was in a deep sleep and then tried laying him in the cot but he woke up within 10 seconds of putting him down. I left him in there and tried patting him back to sleep but he wasn't having any of it!

Thanks for all the ideas Just going to have to be persistent I think.