Hi Hallmark, sorry for delay was in Court all morning.
I don't know where in the country you are and therefore what house prices are like, but I'd assume that if you sold your house and kept all the equity, there's no way you'd be able to buy anything as, assuming your p/t earnings are £10k, the max you could borrow would be £30k. Therefore, if the house is sold you'd have to go into rented.
You may want to think about a Mesher order. That's where the house is transferred into the wife's name (your ex's name would have to stay on the mortgage account even though it'd be off the deeds - see my reply of 11.48 yesterday for details). However the husband isn't losing out altogether as he keeps an interest in the house, secured by a charge (just like a second mortg.)
You and the children stay in the house till the youngest is 18 (or, if earlier, you remarry). At that point, the house is sold and the equity divided, depending on who's been paying the mortgage for all those years.
Either you pay all the mortgage payts (you'd prob. have to convert it to interest only, and/or work f.t when the children are old enough) in which case you'd keep the vast majority of the equity, or if your ex contributes part of the mortgage by way of paying you spousal maintenance, then the share out of capital at the end may be closer to 50/50.
So for example, if your house is worth £200k with £180k mortgage, the payments on interest only will be about £900 per month. If you manage to pay all that from your salary/tax credits/child maintenance/child benefit then you'd expect, when the house sells in 13 years time, to get about 90% of the equity. If your ex pays spousal maintenance of say £450 per month, thereby in a roundabout way paying half the mortgage, then he'd expect to get about 30 to 35% of the equity, assuming he still earns more than you.
So that's what I'd advise on the capital side.
So far as income is concerned, you may or may not get spousal maintenance, it depends on how much of a gap there is between what you have coming in and going out, and whether your ex can reasonably afford to help you bridge that gap.
He has to pay 20% of his net income to you by way of child maintenance whatever happens.
You haven't necessarily shot yourself in the foot in terms of the pension by getting your DA. The pension is probably going to be worth quite a bit, and you can either get a pension sharing order whereby part of it (roughly half) is transferred from his fund into yours, or you can use it as a bargaining tool, ie say he can keep his pension so long as you can get all of the equity/a Mesher order/spousal maintenance.
If you haven't got a lawyer yet, I'd recommend you go to www.resolution.org.uk to find a specialist locally.