There are different of opinions on what constitutes an original UK release.
To me, if it was released around the time of the original recording or issued with a view to getting it into the UK commercial charts, it is an original.
If it was legally pressed many years after it was recorded and issued only for a specialist market like the Northern Soul scene it is not a proper UK release.
So to me, Frank Wilson on the first UK black label Tamla Motown release, was a long time after original recording but it was released in the hope of some commercial chart placing, and the general public, so it is an original UK release. You could of gone and bought it from your local record shop.
But the Pointer Sisters on Out-a-site was released for a specialist Northern Soul market and not intended for the general public and the commercial market, so to me it's not a UK original.
I suppose it is all a matter of your personal viewpoint on it.