postcard.co.uk

I'm re-posting this after 6 years in the hope someone new might have an answer. WHS Kingsway must have been a HUGE operation (taking, processing, printing, distributing) , on the scale of Frith or Valentine - *what happened to their negatives* (presumably glass plates)? Certainly HHH (in a triangle)...

I would like to know that and their starting date; but also WHS Kingsway must have been a HUGE operation, on the scale of Frith or Valentine - *what happened to their negatives* (presumably glass plates)? Certainly HHH (in a triangle) postcards are the same images with the same numbering as Kingsway...