As there's so many questions about divorce I thought I'd share this and hope it helps. Had my initial visit a couple of weeks with my solicitor and here are their list of documents they'll ask for from both parties.
1, 3 months payslips
2, Your last P60
3, Bank Statements from all accounts for the last 12 months
4, Details of any savings with statements
5, Details of liabilities, loans and credit cards etc.
6, Mortgage redemption statement
7, Cash equivalent transfer value for pension
8, Schedule of monthly expenditure
Hope it helps!