CTC is based on earnings from last tax year 2008/2009. I would make sure they know your income this tax year is lower. I gave them a predicted earning for this year so they could adjust my credits accordingly, as DH lost his job in Jan last year, and now he is not working, we would just be up shit the creek without the additional tax credits. I did it because when I return to work i will be doing less hours/earning less money so if DH is still not working we will continue to get the higher credits and if he is working, we will drop back to where we were.
Buy baby gros from ebay. For example, I am selling newborn clothes soon that have only been used once. And will be buying 3-6month clothes that have also only been used once. These next couple of months are a good time of year to do it, as people get bought a lot of clothes for children at christmas in the wrong sizes, or so much they don't get to wear it before it is outgrown (you will find that in coming month or 2).
Are re-useables really much cheaper? Do you have a washing service? If not, think about how much additional electric you might be using (green eco thingy is good if doing a lot of washing), and how much product you will need each month vs cost of disposables. I am using Nature babycare ones, they are fine (for now) and sainsbo's had a deal on a while ago so i bought loads!
Sell stuff on ebay. I am selling all my maternity stuff, incuding several items i never wore as never fit into them (seraphin jacket too big for example), but if you are having another, prob not worth doing that.
Turn your heating down 1 notch (if not done already) and wear a jumper or cardy, put a blanket on the bed. If with EDF, get the green/eco package which has cheaper night rates so you can do washing/dishwasher (if you have one) at night, saves 20%? if you have gas cooker, get a hob kettle, gas is cheaper than electric, saves a lot if you drink lots of tea. Cook in bulk and freeze so you use less gas/electric cooking meals from scratch each time (and saves time), you only then have to thaw and reheat (lasagne for example).
If you have a mortgage, see if you have any mortgage holidays, and if so, whether there are penalties attached/how much. I am able to take up to 6mths break on my mortgage for 'career breaks' such as ML, but i have to continue paying interest which ups the mortgage a little. I am doing it this time, for 3 months, to allow me to have the whole 9 months off.