Phil....
Very sorry re delay in answering, I completely lost sight of the "unread messages" when logging on.
Regarding the Boxster plugs, the correct types are Beru #14FGR-6KQU or Bosch #FGR6KQE - I've used both types with good results. I can buy the Bosch plugs off the shelf here in Australia, but not Beru.
Over the last 4 years, I have found that buying a "service kit" from Design 911 in the UK (design911.com) is by far the cheapest way of getting the parts. Service kit contains:
6 x Beru plugs.
1 x Knecht oil filter.
1 x Hengst air filter.
1 x Hengst cabin filter.
1 x sump plug washer.
The above costs about $A125 delivered ex UK to Queensland, much cheaper than I can buy here. I've been using Design 911 for 4 years without a problem for all my Porsche parts (suspension/service/ accessories etc) at very competitive prices. Delivery takes about a week. Check out their website for all their offerings.
Hope this helps
Stephen

Hi Stephen
thanks for the advice on the spark plugs. I use NGK platinum in a race engine (Ducati M/cycle) and have had good results running high comp with leaded high octane fuel. Would expect they would be good in the Boxster but I've read about Porsche using plugs with multiple outer electrodes. I've no experience of these type so any advice would be much appreciated.