If the finances of your divorce involve a pension or pensions, it will be necessary at the outset to obtain the Cash Equivalent Transfer Value (CETV) for every pension that either of you have ever had.  The spouse with the pension should ask their pension provider to supply the CETV for that pension.  Unless the provider has supplied a CETV within the previous 12 months, the CETV must be provided free of charge.  

You should resist the temptation to start negotiating a financial settlement before you have the CETV of every pension.  This includes the Additional State Pension (formerly the State Second Pension and before that the State Earnings Related Pension - SERPS), for which you need to use Form BR20 which you can download from the DirectGov site at http://www.direct.gov.uk/prod_consum_dg/groups/dg_digitalassets/@dg/@en/@over50/documents/digitalasset/dg_180317.pdf