Divorce advice

TBagpuss

Getting a consent order drawn up to set out the financial agreement would not be massively expensive. There is no reason why you cannot do the paperwork for the actual divorce yourselves, if you want.
Then get a solicitor to draw up the consent order to set out the financial agreement reached.
But Mojisola is right, it's very unwise to trust to a DIY arrangement for something as major as this, particualrly as noone can foresee the future - it's great that you have managed to keep things amicable so far, and hopefully that will continue.
Getting an order drawn up by a real solicitor will also mean that they should flag up any potential issues, or any gaps you may have left in your agreement, so it is about more than just recording your agreement.

DKLS

I wouldn't trust a DIY agreement at all, get a decent solicitor on the case asap, In my experience, my ex went from wanting an amicable split to foaming at the mouth bunny boiler in about a week and resulted in a 18 month legal battle.

pmlindyloo

From what you have said I would recommend you both seeing a Family Mediator.

They would go through every part of your relationship breakdown and you would be able to end up with an agreement which would cover all eventualities which then can be made into a legal document through a solicitor.

There may be a charge for the mediation and obviously for making the agreement into a legal document but mediation is the perfect option for your kind of situation and will be far less expensive than solicitors.

You can find your local family meidation here:

http://www.familymediationcouncil.org.uk/