Hi there,
I've managed by boyfriend's divorce with minimal solictor involvement. Fortunately the Courts Service have had to go digital with Covid, and they seem to have gone with a system where it talks you through everything as you apply online. One of the most useful facts to know when considering options is that the divorce itself, the financial separation and child arrangements are 3 separate processes (with a little bit of tie in between the steps of divorce and finances).
Divorce is £550 for the court fee, and its VERY easy to do online. If you're on benefits or low income etc you can sometimes get this refunded or don't have to pay in the first place. Depending on what grounds you choose for divorce you may also be able to apply for a court order to make them pay your costs, but otherwise they won't have to pay anything.
The court fee for the finacial separation is £53 if you can agree it between yourselves. You'll need 2 things..
a D81 form (statement of information) on which both of you list your basic financial status quo, without needing to show any evidence
a draft consent order, ideally with a 'clean break' claus. This is only called 'draft' because it's not official until it's approved by the Judge.
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The D81 is easy enough but I really would suggest getting the consent order drawn up by a solicitor. It's just not worth the risk of doing it yourself and fluffing it up. That would have been £600 in addition to the court fee, but Cruella the ex threw some spanners in the works so it cost another £600 for hither thither until we gave up and just submitted the damn thing. I'm confident we could have done that extra faffing ourselves but boyfriend is generally useless and didn't think to ask me.
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Child access application costs maybe £255 in court fees, but that was only necessary because she was ignoring all his messages and requests to see their child. If they could have agreed it themselves this part of the process wouldn't even be necessary.
Worth pointing out that his ex has been a NIGHTMARE through the whole thing, but we still managed to get the actual divorce done without solicitor involvement.
Wikivorce is also a great resource, as is the info sheets on gov.uk HMCTS.