IHTM05023 | Is an account required? - other occasions where forms of account are not appropriate (England, Wales and Northern Ireland)
From HM Revenue & Customs · Inheritance Tax Manual
As well as cases where the excepted estates (IHTM05021) regulations apply, the standard form of account (IHTM05031) is not appropriate where the following types of grant are being taken out:
In these cases, Cap Form A5C (IHTM05081) should be completed.
Cap Form A5C is not appropriate where application is made for
a grant caeterorum (IHTM05103)
a new grant following the revocation of a previous grant
In these cases the standard form of account, usually IHT400, (IHTM10021) should be completed.