Name for technique of scribbling, then drawing of bits of scribble I remember there being a technique for scribbling on paper (semi-absent-minded-ly), then looking at the scribbles to find shapes and inspiration.

This is an example of it: https://youtu.be/4JnssoinaUI?t=57s

I cannot remember what it was called or find any information on it.

Any idea what it might be called?
I think what you mean is called ‘automatic drawing’ - it was something done by the surrealists, among others André Masson (the pioneer) and André Breton (probably most famous).

Edit. Then you are probably thinking of the so-called ‘rest-of-the-owl’ technique. Look it up on reddit. Here’s an example: