Good news and bad news.
Good news: I have to put my hand up to not only being an actuary but having been in the RAF for 18+ yrs.
Bad news: I'm a life insurance not a pensions actuary, albeit with the ability to do the sums.
Technically, Fiona is spot on. There is no such thing as a
CETV for a pension in payment. All there is is the value of the pension payments, which can be valued relatively easily once the details of the individual and scheme are known.
It does get complicated, though, when the marriage is only part of the pension-earning period, as is normally the case, which is why courts tend to look at the income stream rather than a fixed value.
Things get even more complicated for you because you went out on ill-health (your pension is worth less because you would be expected to die earlier) and as dependants' benefits are included.
So, some advice.
Have a look at the Services Pensions website. There are a number of publications, but they tend to assume that the victim, oh sorry, serviceman, is still serving so you may find things confusing.
To see how much you're pension is worth, you need to look at what annuity (annual payments until you die) you get for some payment now (try £100,000 first, as this is what annuity rates are quoted for) then do a bit of maths. Say £100k gets you £7,000 a year, then a pension of £3,000 is worth 3,00o/7,000x100,000 = £42,000 say. Try a variety of sites (just search 'annuity rates') and find one with the best fit to you (smoker? physical state? must be inflation-linked ('RPI'), single-life (best idea for now)).
I'm very busy with my divorce and work for a week or two. After that, feel free to contact me directly to let me know how you are getting on and to see if there is anything that I can help you with.