This changed when in 1998, Plymouth and Torbay were separated from the county council to become unitary authorities.

[4] In early 2022, Devon, Plymouth and Torbay were selected as one of nine pilot areas in England by the UK government in the Levelling Up White Paper for "County Deal" negotiations.

[5] Devon and Torbay proceeded without Plymouth with a joint proposal for a Level 2 Devolution Deal, a Combined Authority without a directly elected mayor.

[8] Proposals for a non-mayoral combined county authority was approved by the new Labour government on 19 September 2024.

[12] There are provisions to expand the membership should Plymouth City Council join the DTCCA in the future.