Who was Marion Grey?

I've found this pair of knitting needles - not in the Knitting & Crochet Guild collection, though that's where they are going.  They were in one of my own needle boxes, but I can't remember when I acquired them, or where from - I certainly didn't buy them new.

I must have had them before I got interested in knitting needle makes, and started looking closely at needles for anything that's written on them, because I had never noticed before what's written on these:

MARION GREY, COLINDALE, NO. 7

This is not a needle brand listed in Susan Webster's catalogue, as far as I can see, which is quite exciting.  I suppose it's possible that Marion Grey was a knitter who had a set of needles with her name on (just as you can get personalised pencils and other things with your name on) - but as someone who loses knitting needles far too often, I think that I'd want to put contact information on mine.  'Marion Grey, Colindale' wouldn't be sufficient to find her easily.  Another possibility, which I think is more likely, is that Marion Grey had a yarn shop in Colindale (an area of north London) and had needles made to publicise the shop.  Or, just conceivably, maybe she had a knitting needle factory?

If anyone knows anything about Marion Grey of Colindale, please do let me know.