Thanks for the input thus far. I've found this
site which lists the top 100 NZ tunes ever (+ 33 more). Dave Dobbyn's seems to feature quite a lot and apart from Crowded House I'm afraid that the rest don't seem to get the air play here that they might otherwise deserve (=I've never heard of them)
I am trying to fix a meeting with the B&G but unfortunately neither live here - they are coming over for the wedding, along with friends/family from NZ, Scotland & Ireland (I feel a Proclaimers/Pogues/Crowded House mix in the offering)
I've also checked out the Top 40 chart link provided

and it seems that Umbrella was at No 1 there for several weeks too

holding off Buy You A Drank (Shawty Snappin') T-Pain feat. Yung Joc