Hello Natara. Interesting to hear about your LOG UK-copy.
You said, that it is a regular UK-issue from those days and the golden printed circle is "special" on your copy. Hmm, i have seen golden-coloured printed promo-text-infos on record-covers, mostly from US-releases.
Maybe, your circle-print could be made by a pre-owner of your record, or have you bought it with that mark as a new record from the store.?? If it was not the case it could be an individual mark by pre-owner, or maybe an individual mark for archival purposes by radio-station archive or something like that, but i know that not exactely. Are there some more additional information readable in or close to the circle, like a number or an inscription ??