GN Aus and GN UK are kept as two separate markets, not entirely sure why, but It's a case of grass is always greener on the other side. We've sent a number of UK Grays bats over to Australia recently.
I also recently knocked in an Australian Legend that a regular customer of mine bought and had shipped over.
You are right. I spent a season in England as an overseas player in 2004 and was amazed at the choice of gear you guys had, particularly with all the smaller, boutique brands. Even just local to where I was up in West Yorkshire, there was a guy down the road who made bats, Barronette I think they were called, and they were sublime. Over here it's very much the big brands, plus a couple of local ones and that's about it.
However, it looks as if Kookaburra have given us a shipment of their 2013 UK range early, one guy at the club has the Kooka Menace, which aside from the decals is a lovely bit of willow. Maybe there will be more UK/AUS cross-sell in the future...