That script would've helped me certainly. Rather, I ended up deleting all my layers and organising objects in groups using the Outliner which is what I should have done in the first place.
Basically, what I have learnt: If you are dealing with a large model with a lot of components use the Outliner! (I think that's worthy advice, even if I am a first poster here.)
Also, the good people of SketchUcation are a helpful bunch - thanks for the help all 👍 .
Ryork