Hi Nigel Wardell,
The UK / Italy double taxation agreement advises that the lump sum and pension are taxable only in Italy. Your UK pension provider deducts
tax on the lump sum and pension, as part of their pension guidance.
You therefor, need to claim the tax back from HMRC. To do this, you will need to download and print off, the double taxation treaty form
(Double Taxation: Treaty Relief (Form DT-Individual)
Please complete all the relevant sections and send the signed and dated form to your local Italian tax office.
The Italian tax authorities will validate the completed form, by signing and date stamping the form.
They will return it to you, for you to send it to
HM Revenue and Customs
Pay As You Earn and Self Assessment
HMRC can then instruct the pension company to refund any tax deducted in the current tax year and HMRC will repay any tax overpaid in a previous tax year.