A few useful documents for you

P46 http://www.hmrc.gov.uk/forms/p46.pdf – Issued to new employees if they can’t submit a P45 from their previous employer

SMP1 http://www.dwp.gov.uk/docs/smp1-print.pdf – Used to inform pregnant employees if they are not eligible for Statutory Maternity Pay

SSP1 http://www.dwp.gov.uk/advisers/claimforms/ssp1_print.pdf – Used to inform employees if they are not eligible for Statutory Sick Pay

64-8 http://www.hmrc.gov.uk/forms/64-8.pdf – Authorises communication with an accountant, tax agent or advisor acting on your behalf

FBI 2 http://www.hmrc.gov.uk/forms/fbi2.pdf – Only to be used for accepting information over the internet