How to separate. Shared ownership property and two children

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Hi all
My husband and I are going to split up. It is all my decision.
We have two very small children 2 and 3.he has betrayed my trust.
He earns approx 1200 pcm and I earn approx 850with 150taken at source for childcare vouchers.
We have a shared ownership property, approx 550 Pcm mortgage and 250 pcm rent. Plus all usual bills.
We will have been in the property for 3 years in March and married 4 years in September.

We currently don't qualify for tax credits. I get the lowest rate dla as I have chronic pain plus an autoimmune disease.

I have absolutely idea what to do, how to separate and make a new life for me and the kids. I have of course moved house and left relationships before but never with children and never in poor health.

I paid the mortgage deposit and we pool our wages and take a monthly sum each month which we keep for ourselves, he takes 250 and I take 150 which is topped up with dla and child benefit.
my husband has paid the bulk of the monthly outgoings.

Does anyone know about splitting up if in shared ownership? Does it work exactly the same as a privately owned house?
I have neighbours in full social housing who live in exactly the same house as us but only paying 250 pcm rent for the lot!

Me and Having are still sharing a bedroom but not the bed, it's all very awkward and I really would like some preliminary advice before I have to start paying for advice!

Thanks so much.

The money doesn't seem to add up - on just over £2,000 per year you should be entitled to tax credits with 2 children. And your rent & mortgage is almost half that yet of the remaining money you have £400 over so your bills & food & car costs must be very low?

I think if you separate, money wise you will not be a lot worse off & with tax credits top ups & maintenance of £225 from you stbx should be able to afford to carry on living in the house you are now in if that's what you want.

Hi redhelenb thanks for taking the time to reply. You are completely right I was wrong with his wages, I am having trouble getting my thoughts together, he earns around 2k per month, we take home approx 40k pa between us, my 3 day per week salary is around 11.5 k and he takes home around 28/29k, I should know exact figures but I tend to only notice if we're going overdrawn.
I will get detailed statements ready for when I see the solicitor.
I would love to stay in the house but I can't imagine that it is possible? You have given me some hope though.
I need to take time out to see CAB and a solicitor but I can't envisage doing it before Christmas. I tried to discuss it with H tonight but he just squirmed and left the room!