RM4136 | RO instructions: ask another District to confirm details on voucher
From HM Revenue & Customs · Repayment Claims Manual
Apply the following rules when you ask another District or another section to confirmthe details on a voucher
keep the claim form in the District of claim
if you have to confirm more than one voucher deal with all the vouchers at the same time
put as much information as you can on the covering form you send with the voucher. Include the payer’s reference number if you know it
if you do not know which Scottish District is the payer’s District send the voucher to HMRC Trusts (Edinburgh)
if you do not know which District in Northern Ireland is the payer’s District send the voucher to the Controller, Northern Ireland.