For anyone with WP + Tier 1 , I would like to share few details :
1) I was asked for P60 for all five years - did not have one for 1 P60 for but had p14 ( end of year summary - instead of P60 which is end of year certificate ) . Incase you have lost P60's , ask your employer to issue P14 !
2) Employer letter confirming all 5 years employment. I am still with the same employer and we moved office and the first workpermit had different address . I had applied for change of office and was issued with a letter ( just like original workpermit ) confirming change . After 1.5 hours of waiting , I was asked to confirm office address and luckily I had this document + employer letter.
3) No other questions / documents asked apart from below :
SET (O)
Passports
Last 3 months payslip
Last 3 months bank statement
Last 5 years P60 ( including p14 instead of a missing p60 )
Original Workpermit Issued in 2004
Employer Letter
Life in UK Pass Letter - a pleasant lady with a lovely smile happily informed I scored Top Marks 24/24
Would be glad to answer any queries based on my experience !