Good point, Deltics - I've heard the story in relation to both records. However, every copy of UP 36348 that I have come across has been an EMI copy. If anybody out there has a variation from another plant, I'd be interested to see it :-)
If I remember correctly, staff at the EMI pressing plant refused to press the record. The push-out centre copies look like the initial EMI ones, so I'm assuming the solid centre copies were later outsourced contract pressings.