Is there a web interface for Get_iplayer under linux like there is under Windows?

If so how do I get it/access it?

Yes.
Read the install instructions.

https://github.com/get-iplayer/get_iplay...i/unix#wpm

I run an autostart job of get_iplayer.cgi --listen 127.0.0.1 --port 1935
I also place a bookmark in my web browser of http://localhost:1935/

Thanks for that