Here is a short BSL video from BSL Interpreter Liz May.
A written version is available below.

Hi my name is Liz May
I am a Sign Language Interpreter. What I love most is Theatre interpreting.
What we do and the process of this work is, we watch the rehearsals, their characters, what they are like and get a grip on what makes them their character. And what I am doing will then match the characters on stage.
At the moment tonight and today I am in Chapter in Cardiff interpreting a play called Belonging
It’s really interesting, its lovely to see that there is more access coming in now.
I regularly interpret in different theatres some in Newport some in Cardiff. That’s what we do!
http://southwalesinterpreters.co.uk/interpreters-rsli.html