VATDSAG07050 | What to do if you have reached a conclusion of disaggregation: what records do I need to keep locally?
From HM Revenue & Customs · VAT Single Entity and Disaggregation
It is very likely that every decision that disaggregation has taken place will be appealed, so it is advisable to keep a checklist for each case. Your checklist should include
a local reference number
the trade classification of the business or main business activity
evidence of the financial, economic and organisational links between the entities
the date you authorise VAT Registration Service (VRS) to issue the Notice of Direction
the date the direction is issued
the date registration is effected and any existing registration is cancelled
the registration number
details of any request for reconsideration and the date it is received
the date any reconsideration request is acknowledged
the reconsideration decision
the date the trader is notified of the decision
the date an appeal is lodged (if applicable)
the appeal reference number
the date the review is completed
the date the review is sent to the Solicitor’s office.