Hi,
Thanks very much for your advice. He's been on this routine for about a month now, we struggled a lot with 40min naps previously, so I was really pleased when he started napping for 90min, and haven't dared change anything since! Plus A times are about right I think.
We only did W2S the once, and I think you're right to suggest giving this a proper try. The links about SA are interesting, he's not a clingy baby at all, but has been wanting mummy more recently (I assumed it was just that I'm around more with the holidays....)
I have a chair next to his cot, and have spent a lot of time patting, keeping my hand on him, or just repeating 'sleepy time' whilst sitting there. Tbh I've found gradual withdrawal too gradual to notice until now, maybe I need to be more patient!
I'll let you know how we get on. Thanks again.