Wind up can vary according to scheme rules Rheinie. Your first point of call should be to check your scheme rule book, if you cant find it, the Trustees of the scheme will be able to furnish you with one.
The fact you have 40/60ths already worked up should place you on higher priority than newer members but its worth getting the scheme rules and also contacting the pension scheme provider and asking them for a current transfer value. This will give you a base mark to work off when final settlement is done.
As Don said, the scheme actuaries are most probably looking at asset distribution at the moment.