Well, first I should tell you that if you were not the spouse that issued the divorce petition (ie your ex wife issued it) then once you remarry you will lose all right to ask the court to deal with the financial issues arising from the marriage. However, if your wife issued the petition (and assuming it was properly worded) she would retain the right to pursue you for, say, a pension share even after she remarried. This is because (probably) she commenced the claim with the divorce petition - ie before remarriage.
Second, I suggest you look at this page to understand just how long financial claims can last if they are not dealt with once for all.
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terry.uk]
Having said that, you still need to consider the situation carefully before making a formal claim. After all, your ex has done nothing in the last ten years. Making a formal claim could well stir up a hornets' nest. Whether it is worth doing that very much depends on the figures and an assessment of the risks.
As to your specific questions:-
A. That rather depends upon factors such as the length of the marriage, the value of your respective pensions and how much of that value was built up while you were together.
B. IF you decided to go ahead with this (and bear in mind the note of caution above) the first step would be to get a solicitor to write to your ex asking whether she would consent to an order in X, Y and Z terms to deal with the issues arising from the marriage once for all. If doing it voluntarily doesn't work you would need to make a court application (which will, incidentally, incur costs which will very likely exceed the value of the savings).
C. Trying the voluntary route first and you have a better chance of getting that to work if she can see she is getting something out of it.
D. If you end up having to make a court application there is nothing she can do to stop it.