Stargazing in United Kingdom

England

Bodmin Moor: Bortle 3
Exmoor National Park: Bortle 3
Kielder Water & Forest Park: Bortle 3
Northumberland National Park: Bortle 3
Cranborne Chase: Bortle 4
Lake District National Park: Bortle 4
New Forest: Bortle 4
South Downs National Park: Bortle 4
The Broads: Bortle 4
Yorkshire Dales National Park: Bortle 4

Scotland

Cairngorms National Park: Bortle 2
Galloway Forest Park: Bortle 3
Loch Lomond and The Trossachs National Park: Bortle 4

Wales

Coed y Bont: Bortle 3
Elan Valley: Bortle 3
Eryri National Park: Bortle 3
Pembrokeshire Coast National Park: Bortle 3
Bannau Brycheiniog National Park: Bortle 4

Other parks

Pitcairn Islands: Bortle 1