Turn the key no response !! 2000 Boxster base

[particlewave]

You can bypass the clutch switch by unplugging it and inserting a jumper wire between the wires.

[Frank Porro]

Update.....
I have installed the clutch switch, it works fine.
The car now responds to my turning the key for a start about 80% of the time.
The trick to starting now resides with locking and unlocking the car.
It is most reliable when it has just been unlocked, and not so on a restart.
It appears to be all about the immobilizer.

Thanks for all the advice
Frank