TESB - supporting movie in the U.K?

[Howard]

Did anyone here see The Empire Strikes Back when it was first released in the U.K, that can remember the supporting film?
It was a fantasy movie, 'Brave Knight,' or something along those lines.
I remember a kinda Excalibur vibe to it, a talisman falling into a lake or some other body of water, and the knight urged by a woman to fetch it - or something along those lines.
I'd love to find out more about this movie - as I saw it countless times back in 1980 when seeing Empire.
I've searched IMDB, YouTube, but to no avail!

 

[Mike Rush]

Black Angel

 

[Howard]

Brilliant!
Many thanks indeed, Mike!

 

[Brinn 71]

Woah! Sounds pretty COOL! Hope they release it! Do copies exist right now? What can you remember about this film?

 

[Mike Rush]

I remember it being very atmospheric, and light on dialogue I think.

I was probably too young to appreciate it properly.