So the first thing to do is to list out the APRs, just item by item and put the list in order, highest at the top.
Of the things that are most likely to be towards the top of your list the only one that should be tricky is current account, as there are often fixed elements. What sort of amount do you owe in overdraft to suffer £50 a month payments.
Your first target should be the highest APR item. Ignore all but minimum payments on all but this one, its probably a credit card, but could be your overdraft, then can end up as silly high APR if your only minorly using it.
Then you can look at current account switching. Its possible there is a better one out there for you. Assume you have just one and are not spreading costs across more than one.
Credit worthyness comes into this, but there are often switching bonuses. Nationwide do one if you get referred. Others do them as well you just need to use the switching service. As long as your overdraft isnt high your likely to get accepted, your a target, someone who uses the overdraft makes them money.
If the car loans are PCP look at the rates, they can be quite high. It could be that a relatively small personal loan may help, so you use that to pay off the PCP and reduce your outgoings, maybe over a slightly longer period.
You can ask the PCp loan companies for a settlement quote at any time. For a personal loan look at ZOPA first, I helped someone I know halve their monthly interest payments by just that switch. Same term, just less interest!
It certainly seems that you have a short term cashflow issue, which is increasing your costs (ie overdraft) and you should be far better off once you get past this hump. But the baby incoming is going to hurt. Whats your plan at 6 months going to be?
Do you have old CDs, phones, tables etc you can sell to someone like music magpie. Think of these things as costing you money, if you can sell them on then you can immediately pay that off your debts, saving you interest.
Think a little outside the box, can you travel slightly earlier/later and avoid traffic? Are you sure tyres etc are fully inflated to reduce drag, can you drive a little slower. Maybe eek out a few extra MPG over a month may save you a little. Also may be slightly mechanically sympathetic on your car.
For food, dont assume the discounters are always cheaper as they arent. Eg the cheap tinned toms in tesco are cheaper than both tesco and aldi. Shop less frequently as its easier to control urges, and if you have a freezer look at frozen meat and veg, normally cheaper and easier for portion control.