Vec....
What makes you think there will be compulsory redundancies?
Given that redundancies, if there are any, will probably not be announced until after the election (May/June 10) in order to save political face, and the MOD will take at least 6 months to sort it out, we will be talking about people leaving in late 10 or early 11.
If, and it might well be a big if, the economy is picking up by then, and the employment market is better, there are probably sufficient people who have had enough of a military being hacked to pieces, and the prospect of at least 3 years with at best a 1% pay rise (almost certainly effectively a pay cut), to allow for voluntary redundancies to fulfil any requirement to decrease personnel.
In order to "spin" any reductions in numbers both the politicians and MOD will look at all other alternatives - reductions in recruiting, reducing re-engagements and extensions and voluntary redundancies - before they resort to compulsory dismissals. It makes them "look" like a more caring employer!
Or are you hinting that the manpower reductions required will be so HUGE that only compulsory redundancies will provide the numbers required?
Personally I have no doubt that there will be reductions in personnel, as to the numbers involved.....who knows?