Not sure where “over a dozen Scottish programmes” comes from,

I wasn't judging the folkiness, just going by what the bbc listed on their 'folk' page. (link above)

Music Planet(world music mainly) (r3)
The Folk Show With Mark Radcliffe (r2)
Tim Walker's Folk (Lincolnshire)

Ambell i Gân (Cymru)
Celtic Heartbeat (Wales)
Georgia Ruth (Cymru)

* Blas Ceoil - (Radio Ulster)
Folk Club with Neil Martin (Ulster)
Trad Ar Fad! (Ulster)

A' Mire ri Mòir (Nan Gàidheal)
Caithream Ciùil (Nan Gàidhea)
Catgut and Ivory (Scotland)
Claire and Friends (Scotland\Shetland)
Crùnluath (Nan Gàidheal)
Fae Hameaboot (Scotland)
Iain Anderson (Scotland)
Oota Da Cans (winter only) (Scotland)
Orkney Folk Music with Jennifer Wrigley (Scotland\Orkney)
Orkney Irish Country \What's the Craic with Colin Kirkness (Scotland\Orkney)
Orkney Scottish Dance Music with Liam Muir\Dashing White Farmer (Scotland\Orkney)
Pipeline \Pipes and Drums (Scotland)
The Piping Season (Scotland)
Piping Sounds (Scotland)
Roddy Hart (Scotland)
Saltfish Sessions (Scotland\Orkney)
Take the Floor - Gary Innes (Scotland)
Tiompan (Nan Gàidheal)
Travelling Folk (Scotland)