Hi WMEO
Sorry to hear what you're going through - I'm going through the same with my WW. As others have said, it depends on your personal circumstances. If there is a lot to play for financially then it is obvious that you need to protect yourself. A financial clean break/consent order means no side can make any financial claim against the other once the decree is absolute - or in future years. In other words, get what you want now, if that's the shape of your and your WH's finances.
My advice is get a good lawyer and I would always recommend finding a firm that specialises in family law, rather than a jack of all trades high street firm. They'll be cheaper and they know every trick in the book. They're also smaller so you'll probably get a more personal service. I spoke to the main partner with the one I'm using twice on the phone for free advice before I went with her.
In answer to your other questions:
a) Providing you get everything you're entitled to from WH - pension, property, savings etc, then yes. If you were married more than five years you have a good shot at 50/50 of everything.
b) Get all finances agreed (you both need to fill in a form e -declaring all assets) and a solicitor (from either side) will draft a 'consent order' once you've agreed the detail between you. Both sides sign off on this before it goes to court for a judge to sign off. Then the applicant (whoever is applying for divorce) applies for decree absolute. On Decree Absolute, the court orders pension company to divvy up what's been agreed etc. It costs around £1500 for a consent order. Personally I would advise you find someone you can speak with face to face. Google 'family law' and your city. Some offer fixed fee.
c) Yes - both sides have to agree. Otherwise, it goes to court which gets very expensive and you're at the mercy of a judge deciding the outcome which could go either way.
It's important that this is done BEFORE you apply for Decree Absolute. If Decree Absolute goes through before the consent order, you will lose anything you're entitled to as a spouse in terms of pensions. Decree Absolute is the final, legal ending of the marriage and it's very difficult and costly to sort finances after this.
I've just seen your other reply and it looks like you're sorted so apologies for waffling on! Hope something was helpful. And yes, go after him. He took the vows.