If you have not started divorce proceedings, you start with that. Provided that at least one of the people wishing to get divorced lives in England, then getting divorced in England (& Wales) is infinitely a do-it-yourself job. (I am not familiar with the system in Scotland)
Save yourself a whole load of money: the government website have a do-it-yourself guide
Although you can agree finances between you, it doesn’t draw a line under it unless you have a financial order
And if have children under 18, and you cannot agree who they live with and who sees who and when, then you need a child arrangement order (which includes Specific Issue Orders:
To confirm that something can happen
and a Prohibited Steps Orders
To stop something happening
In the United Kingdom, we do not have “irreconcilable differences”. That is a thing in the United States for the time being at least. The rules are changing here shortly to get rid of the following 5 grounds of divorce and to get rid of the fault issue but that has yet to be enacted. To be honest, in my opinion, it’s going to make very little difference because the big arguments are over finance and children not the actual divorce itself.
It doesn’t matter who divorce is who or why, the financial issues are exactly the same. The court has not apportioned blame with regard to the division of marital finances for many years.
Grounds for getting divorced are:
1 The couple have lived part 2 years or more but less than 5 years and they both consent to the divorce.
2 The couple have lived apart for 5 years or more, regardless of whether they both consent or not.
3 Desertion. Not common.
4 Adultery. Very difficult to prove unless there is unequivocal evidence or an admission.
5 Unreasonable behaviour. Most common and relatively easily to put together a petition on these grounds. For example:
A spouse wants an unreasonable amount of sex/never once it.
Lack of personal hygiene/obsessive personal hygiene.
Obsessively tidy/extremely messy and untidy.
Gambles to excess/it’s tightfisted with money.
Never interacts with spouse or children/obsessive with children.
Violent or bullying or intimidating.
Lots of grounds.