Filming Location:

Hemel Hempstead Old Town

Carpathian Eagle

The wine bar scene was filmed at The Spinning Wheel restaurant. Thanks to Rupert Elmore and Sarah Wareing for finding this location.

Carpathian Eagle Wine Bar Filming Location
The theatre and dressing room scene was filmed at the Arts Centre. Thanks again to Rupert and Sarah for informing me of this location.
Carpathian Eagle filming location theatre
Carpathian Eagle theatre