It airs tonight on HBO in the US... I dunno when in the UK. But methinks you'll be well advised to watch when it does - the previews look terrific:

It's about two poor, hapless New Zealanders who move to New York City to make it big as a folk-ish duo. They do clever satires on music a la Spinal Tap.

Kiwi 1: Where did you get the sandwich?
Kiwi 2: I found it in a bag on the street.
Kiwi 1: (starts to spit it out and stops) I was going to spit it out. But I think I'll just eat it.

And of course there's recurring joke about American's unable to find New Zealand on a map. "There's Vikings there, right?" Kiwi politely agrees. hahah!!

It looks hilarious. I think we'll like it.