Thanks all, I have a 2004 RHD and putting your hand up the hole (2nd one from Left as you look at the front of the car) worked for me. I'm an average build and had to really push my arm all the way to the top (almost to 2/3 of my bicep). Worked a treat!
My issue was that the car wouldn't unlock manually and think I'll have to get the manual lock linkage replaced, once I replaced the battery I was able to open the drivers side door with the key.
The porsche dealer I rang suggested;
1. Break a window and unlock from the inside; OR
2. Tow the car (even though it was in gear and hand brak