It is indeed odd, but the pressing plants using the 670 / 690 / 710 etc. country codes were owned by Philips (who handled Polydor, Mercury, Fontana etc.) and it seems like the plants in the different european countries sometimes used labels from the same source.
There are for example hundreds of norwegian pressings on Polydor with copyright text in german on the label despite the record being pressed in Norway (with country code 710 in the run-out).
Norway and Holland often used the same blank labels for the Fontana 45s.
The UK issue of that Isaac Hayes 45 was handled by Polydor (owned by Philips), so it's likely that the blank labels were made in the UK and shipped out to their "sister"-pressing plant in Holland.