Unfortunately for many HR positions these days people appear to have masters and CIPD. Its not necessary but you will come up against people with both (and before someone says it of course there will be exceptions with neither) . If you are half way through a Masters course and can find a way to finish it I would.
A PgDip just doesn't cut it in the same ay with recruiters.
(personally I don't see the link to what ever under grad degree you got)