I have an Italian passport but have lived & (worked) in

Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question. When you leave the UK for Saudi complete a Form P85 and send it to HMRC. On receipt HMRC will make you non resident for the tax year after your date of departure and furthermore split the leaving year into two portions, one resident and the other non resident. It would seem best to be paid in GBP as the euro is somewhat erratic these days. If you are being paid through PAYE then HMRC will issue the appropriate tax code to as not to deduct tax, only NI contributions. If, however, you are being paid outside the PAYE envelope, you will have to make voluntary NI contributions to keep your card stamped to use an old expression. If you can afford it you can make up back NI contributions to cover those four years though if you have over 35 years contributions this is an exercise in financial futility as you have enough for the proposed new State Pension systems. I do hope that my reply has been of assistance.