Neither of which are in the South West.
Probably not geographically, but what's geography when it comes to government thinking?
The government south west region consists of Gloucestershire, Wiltshire, Dorset, including Bournemouth and Poole, the constituents of the former county of Avon, Somerset, Devon, Cornwall and Isles of Scilly.
As Wycombe points out that's why BOH is in the southwest region but not SOU.
Ideally each sub region would have its own airport.
NQY for Cornwall. EXT for Devon and south Somerset with PLH providing a local back-up service. BOH for Dorset and parts of Wiltshire. BRS for the rest.
Would be lovely but as we know life's not like that.