Hi all, I thought I would get around to posting the above but 623058 has kindly done for me
Basically there was a 2 ident used at launch of Nightscreen around January 1994. Its not the ones above. From what I can remember this 2 ident was done on the cheap and didn't look like a standard 2 ident. I seem to recall some low key computer graphics saw the camera fly around the room and got near to an open book with a static 2 symbol and to the right a window with the night sky.
I haven't been able to find it anywhere online but it was certainly shown during the early part of 1994 when BBC2 launched the new strand.