SDLTM04030 | Scope: How much is chargeable: Non-cash consideration: Land partitioned FA03/SCH4/PARA6
From HM Revenue & Customs · Stamp Duty Land Tax Manual
Where two or more people are jointly entitled to land (whether a single chargeable interest or more than one chargeable interest) and there is a partition or division of the land this is not treated as an exchange. The giving up of a share in one part of the land is not treated as chargeable consideration for the acquisition of a share in another part.
‘Jointly entitled’ means:
in England & Wales, beneficially entitled as joint tenants or tenants in common
in Northern Ireland, beneficially entitled as joint tenants, tenants in common or coparceners.
See the example at SDLTM04030a.