Take care as there seem to be some quite large amounts involved, I would strongly recommend your BF sees a solicitor who specialises in divorce and gets his own professional advice in advance of any court proceedings, It is a commonly held belief that a spouse is entitled to 50% of any pension but this is not correct, a spouse may have some entitlement to believe that they will benefit from the pension when the other spouse retires or dies but on divorce they will have no entitlement.
The parties should try, hopefully with advice, to settle the split of their assets in advance, if not a judge will do so under the Divorce matrimonial clauses act taking some of the following, which is not exhaustive, into account.
The income, earning capacity, property and financial resources of the parties now and in the future.
Their present and future needs and the standard of living prior to the breakdown of the marriage, the value of any benefit lost due to the divorce, such as pensions, remember the law is unisex and the wife may have a pension, your BF may lose the right to benefit from this on divorce.
It can be complicated, if the pension or pensions are money purchase benefits it may be straightforward but if they are a defined benefit pension scheme this may not be as straightforward. The best advice I can give is to seek legal advice from an experienced solicitor.