Sorry if this has been done to death, I just can't get on with the mumsnet search facility and end up with 1000's of irrelevant threads coming up.
As a bit of background, I am currently 27 weeks pg with my 1st, due to go on mat leave in May, return to work Feb 2012. I'm contemplating requesting going down from full time (9-5.30 5 days a week) to 3 full days instead.
DP also works full time, but shifts. These can be anything from 7am to 9pm x5 changeable days a week.
We are very very lucky in that both our familes live nearby and have the flexibility of my mum and DP's mum agreeing to 1 days childcare each for free a week.
Our first choice was a nursery for the 3rd day as we're keen on the interaction/social side of things but our 2 preferred options both have a minimum of 2 days a week which we don't particularly want to pay for if we don't have to.
Someone on here suggested looking into CM's which I'd assumed would be more expensive but after a quick look this afternoon it would seem prices for a full day 8am-6pm round here (Cambridgeshire) are similar to nursery.
My actual question is generally speaking would a CM be happy to do just one full (regular) day a week? And if DP happened to be off that day could we not use the CP (I'm working on the basis we would still pay for that day so as not to leave the CM out of pocket for us being a pain!)
Also, generally speaking how early would you recommend looking into specific CM's and registering interest? 11 months seems so far away but a have a vague feeling in the world of childcare it probably really isn't! 
Thanks in advance